Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Earnings before income taxes	$ 212	$ 286	$ 410	$ 501
Income tax (benefit) expense computed at United States statutory tax rate	74	100	143	175
Valuation allowances (releases)	6	(105)	7	(105)
Audits and settlements	(9)	(32)	(6)	(32)
U.S. foreign income items, net of credits	(34)	(6)	(53)	(11)
Foreign government tax incentive	(2)	(2)	(3)	(4)
Other	(2)	(11)	(15)	(20)
Income tax (benefit) expense computed at effective worldwide tax rates	$ 33	$ (56)	$ 73	$ 3