Available-For-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities
Cost Basis	$ 1,433		$ 1,438
Unrealized pretax net gains (losses)	129		132
Fair Value	1,562		1,570
Charges for other than temporary decIines in the value of securities	0	0
U.S. treasury bonds
Schedule of Available-for-sale Securities
Cost Basis	10		10
Unrealized pretax net gains (losses)	0		0
Fair Value	10		10
Other U.S. and non-U.S. government bonds
Schedule of Available-for-sale Securities
Cost Basis	117		119
Unrealized pretax net gains (losses)	1		1
Fair Value	118		120
Corporate bonds
Schedule of Available-for-sale Securities
Cost Basis	629		612
Unrealized pretax net gains (losses)	22		21
Fair Value	651		633
Asset-backed Securities
Schedule of Available-for-sale Securities
Cost Basis	76		72
Unrealized pretax net gains (losses)	1		0
Fair Value	77		72
U.S. governmental agency mortgage-backed securities
Schedule of Available-for-sale Securities
Cost Basis	326		322
Unrealized pretax net gains (losses)	0		(1)
Fair Value	326		321
Residential
Schedule of Available-for-sale Securities
Cost Basis	17		18
Unrealized pretax net gains (losses)	1		0
Fair Value	18		18
Commercial
Schedule of Available-for-sale Securities
Cost Basis	70		87
Unrealized pretax net gains (losses)	6		6
Fair Value	76		93
Large capitalization value
Schedule of Available-for-sale Securities
Cost Basis	164		173
Unrealized pretax net gains (losses)	74		81
Fair Value	238		254
Smaller company growth
Schedule of Available-for-sale Securities
Cost Basis	24		25
Unrealized pretax net gains (losses)	24		24
Fair Value	$ 48		$ 49