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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Statutory Federal tax rate |  |  | 21.00% | 21.00% | 35.00%
State taxes, net of Federal tax benefit |  |  | 6.00% | 2.00% | (7.00%)
Taxes on foreign earnings |  |  | 12.00% | 9.00% | 0.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent |  |  |  | 0.06 | 0.90
Valuation allowance |  |  | (2.00%) | (2.00%) | 10.00%
Change in tax law |  |  | (1.00%) | 6.00% | 90.00%
Income Tax Expense (Benefit) |  |  | $ 352 | $ 708 | $ 990
Other—net |  |  | (1.00%) | (1.00%) | 0.00%
Effective tax rate |  |  | 35.00% | 35.00% | 128.00%
Guacolda Affiliate [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 19 |  |
UNITED STATES |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Statutory Federal tax rate |  |  | 21.00% |  |
Tax Cuts and Jobs Act, Transition Tax for Accumulated Foreign Earnings, Income Tax Expense |  |  | $ 124 |  |
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) | $ 161 | $ 33 |  | $ 194 |
Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) | $ 77 |  | 17 | $ 77 |
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent |  |  |  | 0.09 | 0.88
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  | $ (38) |
Non-US [Member] |  |  |  |  |
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 26 | $ 35 | $ 26

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