Employee Benefit Plans - Schedule of Components of Level 3 Assets (Details) - Level 3 inputs - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	$ 234	$ 254	$ 231
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(8)	7	17
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	2	8	7
Sales	(26)	(89)	(96)
Purchases	36	54	95
Fair value of plan assets at end of year	238	234	254
U.S. Private Equity Fund
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	21	16	16
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	0	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	1	0
Sales	(4)	(4)	(10)
Purchases	24	8	8
Fair value of plan assets at end of year	41	21	16
U.S. Property Fund
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	10	9	7
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	1	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	1	0	0
Sales	(2)	0	0
Purchases	1	0	2
Fair value of plan assets at end of year	10	10	9
U.S. Hedge Fund
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	164	190	172
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(6)	6	12
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	1	7	7
Sales	(15)	(85)	(84)
Purchases	8	46	83
Fair value of plan assets at end of year	152	164	190
Non-U.S. Property Fund
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	22	21	20
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0	1	1
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0
Sales	0	0	0
Purchases	1	0	0
Fair value of plan assets at end of year	23	22	21
Non-U.S. Insurance Contracts
Defined Benefit Plan Disclosure
Fair value of plan assets at beginning of year	17	18	16
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(2)	(1)	2
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0	0	0
Sales	(5)	0	(2)
Purchases	2	0	2
Fair value of plan assets at end of year	$ 12	$ 17	$ 18