Employee Benefit Plans (Significant Unobservable Inputs) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pension Benefits U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	$ 7,879	$ 7,108
Purchases, Sales, Issuances and Settlements, Net	0	0
Fair value of plan assets at December 31,	7,776	7,879
Pension Benefits U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	2,132	2,279
Pension Benefits U.S. Plans [Member] | Municipals securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	219	258
Pension Benefits U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	729	769
Pension Benefits U.S. Plans [Member] | Other securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	509	497
Pension Benefits U.S. Plans [Member] | Common stock - domestic [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	1,303	1,267
Pension Benefits U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	600	564
Pension Benefits U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	67	8
Other Postretirement Benefits U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	1,320	1,240
Purchases, Sales, Issuances and Settlements, Net	0	0
Fair value of plan assets at December 31,	1,352	1,320
Other Postretirement Benefits U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	171	169
Other Postretirement Benefits U.S. Plans [Member] | Municipals securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	15	71
Other Postretirement Benefits U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	63	51
Other Postretirement Benefits U.S. Plans [Member] | Other securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	54	58
Other Postretirement Benefits U.S. Plans [Member] | Common stock - domestic [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	328	250
Other Postretirement Benefits U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Other Postretirement Benefits U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	3	1
Pension Benefits Non-U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	224	185
Purchases, Sales, Issuances and Settlements, Net	(19)	(11)
Fair value of plan assets at December 31,	248	224
Pension Benefits Non-U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	27
Pension Benefits Non-U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	96	120
Pension Benefits Non-U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	32	24
Pension Benefits Non-U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	2	13
Pension Benefits Non-U.S. Plans [Member] | Real Estate [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	2	7
Level 3 [Member] | Pension Benefits U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	872	619
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	19	32	49
Realized gains (losses)	0	0	0
Unrealized gains (losses)	(2)	(1)	(4)
Purchases, Sales, Issuances and Settlements, Net	19	(12)	(13)
Transfers Into and/or Out of Level 3	23	0	0
Fair value of plan assets at December 31,	59	19	32
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Municipals securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	8	5	4
Realized gains (losses)	0	0	0
Unrealized gains (losses)	1	8	(1)
Purchases, Sales, Issuances and Settlements, Net	(3)	(5)	2
Transfers Into and/or Out of Level 3	5	0	0
Fair value of plan assets at December 31,	11	8	5
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Other securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	7	2	2
Realized gains (losses)	0	0	(1)
Unrealized gains (losses)	0	0	1
Purchases, Sales, Issuances and Settlements, Net	11	5	(1)
Transfers Into and/or Out of Level 3	1	0	1
Fair value of plan assets at December 31,	19	7	2
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Common stock - domestic [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	137	206	240
Realized gains (losses)	(1)	(27)	(59)
Unrealized gains (losses)	9	10	118
Purchases, Sales, Issuances and Settlements, Net	3	(52)	(93)
Transfers Into and/or Out of Level 3	0	0	0
Fair value of plan assets at December 31,	148	137	206
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	447	531	471
Realized gains (losses)	0	55	85
Unrealized gains (losses)	59	(36)	45
Purchases, Sales, Issuances and Settlements, Net	(62)	(103)	(70)
Transfers Into and/or Out of Level 3	156	0	0
Fair value of plan assets at December 31,	600	447	531
Level 3 [Member] | Pension Benefits U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	1	4	0
Realized gains (losses)	(3)	6	2
Unrealized gains (losses)	(18)	(7)	4
Purchases, Sales, Issuances and Settlements, Net	55	(2)	(2)
Transfers Into and/or Out of Level 3	0	0	0
Fair value of plan assets at December 31,	35	1	4
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	1	8
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	4	4	4
Realized gains (losses)	0	0	0
Unrealized gains (losses)	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(3)	0	0
Transfers Into and/or Out of Level 3	0	0	0
Fair value of plan assets at December 31,	1	4	4
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Municipals securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	1	1	1
Realized gains (losses)	0	0	0
Unrealized gains (losses)	0	0	0
Purchases, Sales, Issuances and Settlements, Net	(1)	0	0
Transfers Into and/or Out of Level 3	0	0	0
Fair value of plan assets at December 31,	0	1	1
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Other securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	3	5	6
Realized gains (losses)	(3)	(2)	(1)
Unrealized gains (losses)	4	2	1
Purchases, Sales, Issuances and Settlements, Net	(4)	(2)	(1)
Transfers Into and/or Out of Level 3	0	0	0
Fair value of plan assets at December 31,	0	3	5
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Common stock - domestic [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Other Postretirement Benefits U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,		1	0
Realized gains (losses)		2	0
Unrealized gains (losses)		(2)	1
Purchases, Sales, Issuances and Settlements, Net		(1)	0
Transfers Into and/or Out of Level 3		0	0
Fair value of plan assets at December 31,	0	0	1
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	4	20
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member] | Corporate fixed maturity securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member] | Foreign government debt securities [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member] | Other investments [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at December 31,	0	0
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member] | Derivative Assets [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	13	13	11
Realized gains (losses)	(2)	(1)	0
Unrealized gains (losses)	3	1	2
Purchases, Sales, Issuances and Settlements, Net	(12)	0	0
Fair value of plan assets at December 31,	2	13	13
Level 3 [Member] | Pension Benefits Non-U.S. Plans [Member] | Real Estate [Member]
Rollforward fair value measurement using significant unobservable inputs (level 3) [Roll Forward]
Fair value of plan assets at January 1,	7	8	8
Realized gains (losses)	(1)	(1)	0
Unrealized gains (losses)	1	0	0
Purchases, Sales, Issuances and Settlements, Net	(5)	0	0
Fair value of plan assets at December 31,	$ 2	$ 7	$ 8