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Investment Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available for Sale Securities by Type
Cost	$ 5,377	$ 5,145
Gross Unrealized Gains	421	474
Gross Unrealized Losses	(5)	(5)
Estimated Fair Value	5,793	5,614
U.S. States and Political Subdivisions Debt Securities [Member]
Schedule of Available for Sale Securities by Type
Cost	4,467	4,280
Gross Unrealized Gains	190	199
Gross Unrealized Losses	(5)	(5)
Estimated Fair Value	4,652	4,474
U.S. Government agency obligations [Member]
Schedule of Available for Sale Securities by Type
Cost	3	3
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	3	3
U.S. Government treasury obligations [Member]
Schedule of Available for Sale Securities by Type
Cost	330	330
Gross Unrealized Gains	7	8
Gross Unrealized Losses	0	0
Estimated Fair Value	337	338
Corporate debt securities [Member]
Schedule of Available for Sale Securities by Type
Cost	39	73
Gross Unrealized Gains	5	6
Gross Unrealized Losses	0	0
Estimated Fair Value	44	79
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Schedule of Available for Sale Securities by Type
Cost	190	210
Gross Unrealized Gains	12	14
Gross Unrealized Losses	0	0
Estimated Fair Value	202	224
Equity securities [Member]
Schedule of Available for Sale Securities by Type
Cost	55	64
Gross Unrealized Gains	196	232
Gross Unrealized Losses	0	0
Estimated Fair Value	251	296
Foreign government bonds and obligations [Member]
Schedule of Available for Sale Securities by Type
Cost	242	134
Gross Unrealized Gains	11	15
Gross Unrealized Losses	0	0
Estimated Fair Value	253	149
Availabe For Sale Securities Other [Member]
Schedule of Available for Sale Securities by Type
Cost	51	51
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 51	$ 51

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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