Fair Value Measurements Changes in Fair Value Level 3 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Investment Segment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward]
Balance at January 1	$ 288	$ 289
Gross realized and unrealized gains	(4)	(4)
Gross proceeds	(5)	(5)
Balance at December 31	287	288
Holding Company [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward]
Balance at January 1	81	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	67	0
Transfer in	0	81
Gross realized and unrealized gains	(32)	0
Balance at December 31	116	81
Fair Value, Inputs, Level 3 [Member] | Recurring measurement [Member] | Railcar and Food Packaging [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward]
Balance at January 1	30	27
Realized/unrealized gains (losses), net	3	3
Purchases and settlements, net	(12)	0
Balance at December 31	21	30
Fair Value, Inputs, Level 3 [Member] | United States Plans | Recurring measurement [Member] | Automotive Segment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward]
Balance at January 1	14	0
Realized/unrealized gains (losses), net	11	2
Purchases and settlements, net	83	12
Gross proceeds	(23)	0
Balance at December 31	85	14
Fair Value, Inputs, Level 3 [Member] | Non-U.S. Plans | Recurring measurement [Member] | Automotive Segment [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, [Roll Forward]
Balance at January 1	42	35
Realized/unrealized gains (losses), net	1	1
Purchases and settlements, net	6	7
Gross proceeds	(6)	(2)
Foreign currency exchange rate movements	1	1
Balance at December 31	$ 44	$ 42