Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Undistributed earnings of foreign subsidiaries	$ 21	$ 26
Tax Credits	131	2
Valuation allowance	104	57
Unrecognized tax benefits that would impact effective tax rate	35	71	$ 104
Penalties and interest expense		(12)	$ (7)
Penalties accrued	75	125
Deposit to reduce unrecognized tax benefit liabilities	12	22
Related party taxes payable	0	636
Tax Year 2036 [Member]
Income Taxes [Line Items]
Net operating loss carryforward	409
Tax Credits	131
Tax Year 2032 [Member]
Income Taxes [Line Items]
Net operating loss carryforward	84
Expiring Indefinitely [Member]
Income Taxes [Line Items]
Net operating loss carryforward	105
Tax Year 2010 and 2011 [Member]
Income Taxes [Line Items]
Related party taxes payable		296
Minimum [Member]
Income Taxes [Line Items]
Gross unrecognized tax benefits could decrease, lower bound	20
U.S. [Member] | Tax Year 2010 and 2011 [Member]
Income Taxes [Line Items]
Contributions from GM		$ 296
Foreign Tax Authority [Member]
Income Taxes [Line Items]
Valuation allowance	50
Domestic Tax Authority [Member]
Income Taxes [Line Items]
Valuation allowance	$ 54
Parent Company [Member] | U.S. [Member]
Income Taxes [Line Items]
Deferral period	4 years