Available-For-Sale Securities (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities.
Cost Basis	$ 1,398	$ 1,375
Unrealized pretax net gains (losses)	100	72
Fair Value	1,498	1,447
U.S. treasury bonds
Schedule of Available-for-sale Securities.
Cost Basis	12	10
Fair Value	12	10
Other U.S. and non-U.S. government bonds
Schedule of Available-for-sale Securities.
Cost Basis	121	90
Unrealized pretax net gains (losses)	2	2
Fair Value	123	92
Corporate bonds
Schedule of Available-for-sale Securities.
Cost Basis	569	542
Unrealized pretax net gains (losses)	35	30
Fair Value	604	572
Asset-backed securities
Schedule of Available-for-sale Securities.
Cost Basis	99	112
Unrealized pretax net gains (losses)	(1)	(1)
Fair Value	98	111
U.S. governmental agency mortgage-backed securities
Schedule of Available-for-sale Securities.
Cost Basis	266	297
Unrealized pretax net gains (losses)	13	13
Fair Value	279	310
Residential mortgage-backed securities
Schedule of Available-for-sale Securities.
Cost Basis	32	33
Unrealized pretax net gains (losses)	(3)	(3)
Fair Value	29	30
Commercial mortgage-backed securities
Schedule of Available-for-sale Securities.
Cost Basis	137	142
Unrealized pretax net gains (losses)	6	3
Fair Value	143	145
Large capitalization value
Schedule of Available-for-sale Securities.
Cost Basis	133	127
Unrealized pretax net gains (losses)	35	21
Fair Value	168	148
Smaller company growth
Schedule of Available-for-sale Securities.
Cost Basis	29	22
Unrealized pretax net gains (losses)	13	7
Fair Value	$ 42	$ 29

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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