| **Additional Financial Statement Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions** | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------|-----------------|
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| **Cash Paid During the Year For**                                                                                     |            |   |   |
| Interest, Net of Amount Capitalized                                                                                   | $ 270           | $ 346 | $ 327 |
| Income Taxes Paid, Net                                                                                                | 172             | 121 | 236 |
| **Non-Cash Financing and Investing Activities**                                                                       |            |   |   |
| Increase in Capital Lease Obligations                                                                                 | $ 14            | $ 0 | $ 5 |

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| - Definition
The increase during the period in capital lease obligations due to entering into new capital leases.
+ References
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| - References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
+ References
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| - Definition
Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.
+ References
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| - References
No definition available.
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