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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	$ 2	$ 4
Unrecognized Tax Benefits, Period Increase (Decrease)	$ (2)	$ (3)	$ 1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	35.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 448	$ 446	$ 332
Effective Income Tax Rate Reconciliation, Percent	35.00%	35.00%	128.00%
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 463	$ 348
Additions for current year tax positions	6	2	$ 0
Additions for tax positions of prior years	4	146	2
Reductions for tax positions of prior years	(5)	(26)	(5)
Lapse of statute of limitations	(3)	(7)	(1)
Ending balance	465	463	348
Unrecognized Tax Benefits, Income Tax Penalties Accrued	0	0
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0	$ 0	$ 0
UNITED STATES
Income Tax Contingency [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	$ 161

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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