Income Taxes - Possible Changes and Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reasonably possible change in unrecognized tax benefits
Unused foreign tax credits expiring in 2017 through 2026	$ 413	$ 389
Unused research tax credits expiring from 2019 to 2036	14
Alternative minimum tax credits	18
Operating and capital loss carryforwards with indefinite life	151
Operating and capital loss carryforwards expiring between 2017 and 2036	238
Valuation allowance	1,094	1,135
Equity in undistributed earnings of foreign subsidiaries	2,200
Reconciliation of the Company's total gross unrecognized tax benefits
Balance at beginning of the period	74	77	$ 100
Additions and reductions for tax positions of prior years		1
Additions and reductions for tax positions of prior years			(13)
Additions based on tax positions related to the current year	15	10	10
Reduction due to lapse of the applicable statute of limitations	(3)	(5)	(8)
Reductions due to settlements	(12)	(1)	(1)
Foreign currency translation		(8)	(11)
Balance at ending of the period	74	74	77
Unrecognized tax benefits, which if recognized, would impact the Company's effective income tax rate	66	67	70
Accrued interest and penalties	23	25	29
Interest and penalties included in tax expense	$ (2)	$ (1)	$ (2)
Period during which unrecognized tax benefits are reasonably possible of being settled as a result of audit settlements or statute expirations	12 months
Maximum
Reconciliation of the Company's total gross unrecognized tax benefits
Reasonably possible decrease in unrecognized tax benefits related to audit settlements or statute expirations	$ 11