Income Taxes (Analysis of the Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
United States	$ 215	$ 177	$ 463
State	94	63	52
Other countries	238	229	330
Total	547	469	845
United States	50	16	(68)
State	(16)	22	(3)
Other countries	(5)	(36)	2
Total	29	2	(69)
Total provision for income taxes	$ 576	$ 471	$ 776