Income Taxes (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Tax cuts and jobs act of 2017, provisional income tax benefit				$ 2,870
Deemed repatriation tax liability, provisional income tax expense				149
Aggregate income tax benefit	$ 89
Tax cuts and jobs act of 2017, income tax expense (benefit)			$ 36
Decrease in valuation allowance		$ (14)
Unrecognized tax benefits that if recognized would affect our effective tax rate		15	1	5
Accrued liabilities for interest and penalties		10	5	8
Increase (decrease) in income tax penalties and interest accrued		(3)		1
Income tax expense (benefits) reflected in the capital in excess of par column of the consolidated statement of equity		123	$ 13	$ 81
Repatriation tax adjustment, decrease in income tax expense		42
Germany
Deferred tax assets, operating loss carryforwards, foreign		33
United States
Tax credit carryforwards		15
United Kingdom
Deferred tax assets, operating loss carryforwards, foreign		$ 5