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Income Taxes (Analysis of the Provision for Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
United States	$ 463	$ 523	$ 223
State	52	53	56
Other countries	330	361	394
Total	845	937	673
United States	(68)	(40)	(180)
State	(3)	31	(74)
Other countries	2	(6)	(1)
Total	(69)	(15)	(255)
Total provision for income taxes	$ 776	$ 922	$ 418

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