Income Taxes - Possible Changes and Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reasonably possible change in unrecognized tax benefits
Foreign tax credit carryovers	$ 117	$ 96
Unused foreign tax credits expiring in 2020 through 2029	81
Unused foreign tax credits carried over indefinitely	36
Operating and capital loss carryforwards with indefinite life	166
Operating and capital loss carryforwards expire between 2020 and 2039	106
Unused research tax credits expiring from 2020 to 2038	17
Reconciliation of the Company's total gross unrecognized tax benefits
Balance at beginning of the period	87	79	$ 74
Additions and reductions for tax positions of prior years	16		1
Additions and reductions for tax positions of prior years		(4)
Additions based on tax positions related to the current year	12	15	17
Reduction due to lapse of the applicable statute of limitations			(7)
Reductions due to settlements	(16)		(9)
Foreign currency translation		(3)
Foreign currency translation			3
Balance at ending of the period	99	87	79
Unrecognized tax benefits, which if recognized, would impact the Company's effective income tax rate	86	78	72
Accrued interest and penalties	11	10	8
Interest and penalties included in tax expense	$ 1	$ 2	$ (15)
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	$ 6