Pension, Other Postretirement Benefits and Savings Plans (Fair Value of Pension Plan Assets) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	$ 6,250	$ 4,800
Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2,721	2,455
Cash and Short Term Securities [Member] | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	229	156
Cash and Short Term Securities [Member] | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	32	63
Cash and Short Term Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	218	139
Cash and Short Term Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	27	35
Cash and Short Term Securities [Member] | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	11	17
Cash and Short Term Securities [Member] | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	5	28
Cash and Short Term Securities [Member] | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Cash and Short Term Securities [Member] | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
U.S. Companies | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		55
U.S. Companies | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		23
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		55
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		23
U.S. Companies | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
U.S. Companies | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
U.S. Companies | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
U.S. Companies | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
Non U.S. Companies | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	534
Non U.S. Companies | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	19	79
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	531
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	79
Non U.S. Companies | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	3
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	12	1,161
Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	328	428
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	19	23
Commingled Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	12	1,161
Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	309	405
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	70	54
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	7	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	63	47
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	362	328
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	133	119
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	229	209
Partnership Interests | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Equity Securities, Equity Collars | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		(129)
Equity Securities, Equity Collars | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
Equity Securities, Equity Collars | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		(129)
Equity Securities, Equity Collars | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
Corporate Bonds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2,678	1,215
Corporate Bonds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	179	157
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	17	15
Corporate Bonds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2,678	1,214
Corporate Bonds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	162	142
Corporate Bonds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	1
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	1,401	737
Government Bonds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	616	533
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	57	56
Government Bonds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	1,401	735
Government Bonds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	559	477
Government Bonds | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	2
Government Bonds | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Asset Backed Securities | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	123	46
Asset Backed Securities | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	4	5
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	3
Asset Backed Securities | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	123	45
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	1
Asset Backed Securities | 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	960	624
Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	1,204	751
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	1
Commingled Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	960	624
Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	1,204	750
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	468	150
Mutual Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	28	34
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	23	27
Mutual Funds | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	468	150
Mutual Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	5	7
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
Interest Rate Swaptions | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		(125)
Interest Rate Swaptions | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
Interest Rate Swaptions | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		(125)
Interest Rate Swaptions | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value		0
Commingled Funds | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Commingled Funds | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	129	171
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	0	0
Commingled Funds | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	7	8
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	122	163	143
Real Estate | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	37
Real Estate | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	136	173
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	37
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
Real Estate | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Real Estate | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2	3
Real Estate | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	0
Real Estate | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	134	170	138
Other Investments | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2	3
Other Investments | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	24	24
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
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	3	3
Other Investments | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	1
Other Investments | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	0	2
Other Investments | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2	2
Other Investments | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	21	19
Total Investments | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	6,235	4,792
Total Investments | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2,769	2,495
Total Investments | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	218	762
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	174	272
Total Investments | Significant Other Observable Inputs (Level 2) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	5,786	3,815
Total Investments | Significant Other Observable Inputs (Level 2) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	2,318	1,871
Total Investments | Significant Unobservable Inputs (Level 3) | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	231	215
Total Investments | Significant Unobservable Inputs (Level 3) | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	277	352
Other Assets | U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	15	8
Other Assets | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Plan Assets, Fair Value	$ (48)	$ (40)