| **Postretirement Benefits - Schedule of Amounts Recognized in Accumulated Other Comprehensive Income (Details) (USD $)In Millions, unless otherwise specified** | 12 Months Ended                                                                                                                                                                                                                |                                                                                                                                                                                                                                 |
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| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                |                                                                                                                                                                                                                           |                                                                                                                                                                                                                            |
| Noncurrent liability                                                                                                                                            | $ 2,862us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent                                                                                                                                           | $ 2,564us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent                                                                                                                                            |
| Net liability recognized                                                                                                                                        | 2,955us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent                                                                                                                                   | 2,652us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent                                                                                                                                    |
| Pension Benefits                                                                                                                                                |                                                                                                                                                                                                                           |                                                                                                                                                                                                                            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                |                                                                                                                                                                                                                           |                                                                                                                                                                                                                            |
| Current liability                                                                                                                                               | 15us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                          | 14us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                           |
| Noncurrent liability                                                                                                                                            | 1,399us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                    | 1,410us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                     |
| Net liability recognized                                                                                                                                        | 1,414us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                          | 1,424us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                           |
| Net actuarial loss                                                                                                                                              | (2,019)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                           | (1,947)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                            |
| Net prior service cost (benefit)                                                                                                                                | 1us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                      | 1us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                       |
| Net amount recognized                                                                                                                                           | 2,020us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                           | 1,948us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                            |
| Amortization of prior service cost (benefit)                                                                                                                    | 0us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                                 |                                                                                                                                                                                                                            |
| Amortization of cumulative losses                                                                                                                               | 98us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_PensionPlansDefinedBenefitMember                                                              |                                                                                                                                                                                                                            |
| Health and Life Insurance Benefits                                                                                                                              |                                                                                                                                                                                                                           |                                                                                                                                                                                                                            |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                |                                                                                                                                                                                                                           |                                                                                                                                                                                                                            |
| Current liability                                                                                                                                               | 79us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                       | 73us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                        |
| Noncurrent liability                                                                                                                                            | 1,463us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                 | 1,154us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                  |
| Net liability recognized                                                                                                                                        | 1,542us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember       | 1,227us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesCurrentAndNoncurrent/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember        |
| Net actuarial loss                                                                                                                                              | (664)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember          | (354)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember           |
| Net prior service cost (benefit)                                                                                                                                | (6)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember | (10)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember |
| Net amount recognized                                                                                                                                           | 658us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                          | 344us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                           |
| Amortization of prior service cost (benefit)                                                                                                                    | (4)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                            |                                                                                                                                                                                                                            |
| Amortization of cumulative losses                                                                                                                               | $ 39us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis= us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember                                         |                                                                                                                                                                                                                            |

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| - Definition
The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.
+ References
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| - Definition
The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.
+ References
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| - Definition
Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=6521920Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Prior Service Cost -URI http://asc.fasb.org/extlink&oid=6521884
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| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
+ Details**Name:**us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss**Namespace Prefix:**us-gaap_**Data Type:**xbrli:monetaryItemType**Balance Type:**credit**Period Type:**duration |
| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position.
+ References
No definition available.
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| - Definition
For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan.
+ References
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| - Definition
This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.
+ References
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