Pension, Other Postretirement Benefits and Savings Plans - Fair Values of Pension Plan Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	$ 5,011	$ 6,250	$ 4,800
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,493	2,721	2,455
Cash and Short Term Securities | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	240	229
Cash and Short Term Securities | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	30	32
Cash and Short Term Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	237	218
Cash and Short Term Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	28	27
Cash and Short Term Securities | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	3	11
Cash and Short Term Securities | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2	5
Cash and Short Term Securities | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Cash and Short Term Securities | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	19	19
Non-U.S. Companies | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	19	19
Non-U.S. Companies | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Non-U.S. Companies | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	6	12
Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	231	328
Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	17	19
Commingled Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	6	12
Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	214	309
Commingled Funds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	61	70
Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	3	7
Mutual Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	58	63
Mutual Funds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Partnership Interests | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	295	362
Partnership Interests | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Partnership Interests | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Partnership Interests | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Partnership Interests | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	75	133
Partnership Interests | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Partnership Interests | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	220	229
Partnership Interests | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Corporate Bonds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,413	2,678
Corporate Bonds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	151	179
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Corporate Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	14	17
Corporate Bonds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,413	2,678
Corporate Bonds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	137	162
Corporate Bonds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Corporate Bonds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Government Bonds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	1,091	1,401
Government Bonds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,097	616
Government Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Government Bonds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	67	57
Government Bonds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	1,091	1,401
Government Bonds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,030	559
Government Bonds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Government Bonds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Repurchase Agreements | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Repurchase Agreements | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	(719)
Repurchase Agreements | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Repurchase Agreements | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Repurchase Agreements | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Repurchase Agreements | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	(719)
Repurchase Agreements | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Repurchase Agreements | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0
Asset Backed Securities | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	158	123
Asset Backed Securities | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	11	4
Asset Backed Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Asset Backed Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2	2
Asset Backed Securities | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	158	123
Asset Backed Securities | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2	2
Asset Backed Securities | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Asset Backed Securities | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Purchases, sales, issuances and settlements (net)	7
Plan assets, fair value	7	0
Realized gains (losses)	0
Unrealized (losses) gains relating to instruments still held at the reporting date	0
Commingled Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	714	960
Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	342	1,204
Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	714	960
Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	342	1,204
Commingled Funds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Commingled Funds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	86	468
Mutual Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	8	28
Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	3	23
Mutual Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	86	468
Mutual Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	5	5
Mutual Funds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Mutual Funds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	125	129
Alternatives, Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	6	7
Alternatives, Commingled Funds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Commingled Funds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Purchases, sales, issuances and settlements (net)	1	(42)
Plan assets, fair value	119	122	163
Realized gains (losses)	0	1
Unrealized (losses) gains relating to instruments still held at the reporting date	2	7
Alternatives, Real Estate | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Real Estate | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	143	136
Alternatives, Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Real Estate | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Real Estate | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Real Estate | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2	2
Alternatives, Real Estate | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Real Estate | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Purchases, sales, issuances and settlements (net)	2	(47)
Plan assets, fair value	141	134	$ 170
Realized gains (losses)	0	1
Unrealized (losses) gains relating to instruments still held at the reporting date	12	18
Alternatives, Other Investments | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	2
Alternatives, Other Investments | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	68	24
Alternatives, Other Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	0	0
Alternatives, Other Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	1	3
Alternatives, Other Investments | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	(2)	0
Alternatives, Other Investments | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	6	0
Alternatives, Other Investments | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2	2
Alternatives, Other Investments | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	61	21
Total Investments | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	5,003	6,235
Total Investments | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,567	2,769
Total Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	237	218
Total Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	154	174
Total Investments | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	4,544	5,786
Total Investments | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	2,085	2,318
Total Investments | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	222	231
Total Investments | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	328	277
Other | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	8	15
Other | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan assets, fair value	$ (74)	$ (48)