| **Leases - Lease Maturity (Details) - USD ($) $ in Millions** | Mar. 31, 2019 | Dec. 31, 2018 |
|---------------------------------------------------------------|---------------|---------------|
| **Operating Leases**                                          |          |          |
| Remainder of 2019                                             | $ 73          |          |
| 2020                                                          | 83            |          |
| 2021                                                          | 47            |          |
| 2022                                                          | 32            |          |
| 2023                                                          | 19            |          |
| 2024 and thereafter                                           | 67            |          |
| Total Lease Liabilities, Undiscounted                         | 321           |          |
| Less: Imputed Interest                                        | 41            |          |
| Total Lease Liabilities                                       | 280           |          |
| **Finance Leases**                                            |          |          |
| Remainder of 2019                                             | 37            |          |
| 2020                                                          | 47            |          |
| 2021                                                          | 32            |          |
| 2022                                                          | 22            |          |
| 2023                                                          | 20            |          |
| 2024 and Thereafter                                           | 105           |          |
| Total Lease Liabilities, Undiscounted                         | 263           |          |
| Less: Imputed Interest                                        | 48            |          |
| Total Lease Liabilities                                       | 215           | $ 223         |
| **Total**                                                     |          |          |
| Remainder of 2019                                             | 110           |          |
| 2019                                                          |          | 143           |
| 2020                                                          | 130           | 120           |
| 2021                                                          | 79            | 90            |
| 2022                                                          | 54            | 84            |
| 2023                                                          | 39            | 70            |
| 2024 and Thereafter                                           | 172           | 280           |
| Total Lease Liabilities, Undiscounted                         | 584           | 787           |
| Operating lease liability, current                            | 86            |          |
| Finance lease liability, current                              | $ 41          | 41            |
| **Operating Leases**                                          |          |          |
| 2019                                                          |          | 91            |
| 2020                                                          |          | 74            |
| 2021                                                          |          | 59            |
| 2022                                                          |          | 62            |
| 2023                                                          |          | 50            |
| 2024 and Thereafter                                           |          | 176           |
| Total Lease Liabilities, Undiscounted                         |          | 512           |
| **Finance Leases**                                            |          |          |
| 2019                                                          |          | 52            |
| 2020                                                          |          | 46            |
| 2021                                                          |          | 31            |
| 2022                                                          |          | 22            |
| 2023                                                          |          | 20            |
| 2024 and Thereafter                                           |          | 104           |
| Total Lease Liabilities, Undiscounted                         |          | $ 275         |

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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