Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at the U.S. federal tax rate of 35%		$ 72	$ 8	$ 169
Foreign income tax differential		10	20	(38)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount		3	2	(1)
U.S. permanent book/tax differences		3	0	1
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment, Amount		2	2	2
Effective Income Tax Rate Reconciliation, Executive Compensation		9	4	1
Employee Benefits and Share-based Compensation		2	3	(3)
Impact of intangible asset transfer		245	0	0
Effective Income Tax Rate Reconciliation, foreign derived intangible income deduction		(7)	(1)	0
Effective Income Tax Rate Reconciliation, Branch Status Change		(17)	(9)	0
Goodwill impairment		0	30	0
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Research and Development, Amount		(5)	(6)	(4)
Effective Income Tax Rate Reconciliation, Deduction, Amount		0	0	(9)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	[1]	(16)	16	0
US Tax Reform, Provisional Tax Expense		0	37	130
Gains/losses on entity liquidations tax impact		(12)	0	0
Effective Income Tax Rate Reconciliation, Change in Foreign Deferred Tax Assets Valuation Allowance, Amount		(74)	2	0
Change in liability for unrecognized tax benefits	[1]	4	(23)	(2)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount		(1)	(11)	0
Other, net		(1)	(1)	(4)
Total income tax expense (benefit)		(273)	$ 73	$ 242
Net tax benefit associated with the transfer of certain intangible assets		$ 264

[1] ⁽¹⁾ Does not include the impact of items included in the U.S. Tax Reform category