Income Taxes (Schedule of Reconciliations Between Tax Expense and The Consolidated Effective Income Tax Rate for Earnings Before Income Taxes and Other Items - Tax Rates) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings before income taxes
United States	$ 671	$ 605	$ 555
Foreign	216	509	476
Earnings before income taxes	887	1,114	1,031
Income tax computed at United States statutory rate	310	390	361
U.S. government tax incentives	(13)	(9)	(13)
Foreign government tax incentives, including BEFIEX	(29)	(11)	(19)
Foreign tax rate differential	(14)	(50)	(36)
U.S. foreign tax credits	17	(86)	(103)
Valuation allowances	(68)	(121)	(95)
State and local taxes, net of federal tax benefit	29	20	18
Foreign withholding taxes	41	36	16
U.S. tax on foreign dividends and subpart F income	12	63	57
Settlement of global tax audits	48	(40)	16
U.S. Transition Tax	190	0	0
Changes in enacted tax rates	49	32	0
Other items, net	(22)	(38)	7
Total income tax expense	$ 550	$ 186	$ 209