Income Taxes Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income tax provision computed at US federal statutory tax rate	$ 473	$ 208	$ 317
Change in valuation allowance	(1)	(47)	94
Equity income and dividends	(54)	(38)	(48)
(Income) expense not resulting in tax impact, net	(46)	(9)	(51)
US tax effect of foreign earnings and dividends	65	85	25
Foreign tax credits	(51)	(76)	(20)
Other foreign tax rate differentials	7	4	17
Legislative changes	1	(3)	(59)
State income taxes, net of federal benefit	4	6	4
Other, net	33	(6)	13
Income tax provision (benefit)	$ 247	$ 124	$ 292
Effective income tax rate	11.00%	13.00%	19.00%
Effective Income Tax Rate Reconciliation, Recognition of basis differences in investment in affiliates, Amount	$ (14)	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Asset transfers between wholly owned foreign affiliates, Amount	(170)	$ 0	$ 0
Unrecognized Tax Benefit, Decrease resulting from changes in uncertain tax position and impacts of amended tax return filings	$ 40