Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Federal statutory tax rate	35.00%
U.S. Federal income tax expense at the statutory rate of 35%	$ 422	$ 213	$ 240
U.S. credits (R&D, foreign tax credits) and benefits offset to OCI	(163)	(72)	0
Adjustment for foreign income taxed at different rates	(51)	(39)	(37)
State income taxes, net of U.S. Federal benefit	16	10	12
Net foreign losses (income) with no tax due to valuation allowances	8	(19)	49
Net establishment (resolution) of uncertain tax positions	3	(13)	3
Deferred tax impact of enacted tax rate and law changes	(2)	(2)	33
Deconsolidation of Venezuelan subsidiary	0	157	0
Provision for undistributed foreign earnings	0	0	131
Other	5	1	2
United States and Foreign Tax (Benefit) Expense	(77)	232	(1,834)
Domestic Tax Authority
Income Taxes [Line Items]
Net establishment (release) of foreign valuation allowances	39	(8)	(2,318)
Foreign Tax Authority
Income Taxes [Line Items]
Net establishment (release) of foreign valuation allowances	$ (354)	$ 4	$ 51