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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