Income Taxes Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax provision computed at US federal statutory tax rate	$ 208	$ 317	$ 376
Change in valuation allowance	(47)	94	218
Equity income and dividends	(38)	(48)	(87)
(Income) expense not resulting in tax impact, net	(9)	(51)	(157)
US tax effect of foreign earnings and dividends	85	25	521
Foreign tax credits	(76)	(20)	(759)
Other foreign tax rate differentials	4	17	(38)
Legislative changes	(3)	(59)	116
State income taxes, net of federal benefit	6	4	12
Other, net	(6)	13	11
Income tax provision (benefit)	$ 124	$ 292	$ 213
Effective income tax rate	13.00%	19.00%	20.00%