Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Provision for income taxes	$ 676	$ 576	$ 471
Undistributed earnings of foreign subsidiaries expected to be repatriated	111	103
Undistributed earnings of foreign subsidiaries	7,900
Operating Loss Carryforwards, Valuation Allowance	958
Income tax loss carryforwards, subject to expiration	441
Remaining amount of loss carryforwards that has no expiration date	517
Unrecognized tax benefits that would reduce our effective tax rate if recognized	427
Total accrued penalties and net accrued interest	20	16
Aggregate resolution of uncertainties	180
Income Taxes
Income Tax, Nonrecurring capital loss from a legal entity restructuring		$ 47
U.S. Tax Cuts and Jobs Act
Income Taxes
Net Expense for U.S. Tax Cuts and Jobs Act			36
Provision for income taxes			$ 81
Undistributed earnings of foreign subsidiaries expected to be repatriated	700
Undistributed earnings of foreign subsidiaries	5,200
Undistributed earnings of foreign subsidiaries considered indefinitely reinvested	4,500
Brazil Tax Matter [Member]
Income Taxes
Proposed Tax Adjustments and Penalties, Foreign Tax Authority	$ 70