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Investments (Short-Term and Long-Term Investments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Total investments, Amortized Cost $ 17,988 $ 16,333
Total investments, Gross Unrealized Gains 794 532
Total investments: Gross Unrealized Losses (32) (81)
Total investments, Fair Value 18,750 16,784
Available-For-Sale [Member] | Debt Securities [Member]
   
Available-for-sale securities, Amortized Cost 17,262 15,622
Available-for-sale securities, Gross Unrealized Gains 764 505
Available-for-sale securities, Gross Unrealized Losses (24) (67)
Available-for-sale securities, Fair Value 18,002 16,060
Available-For-Sale [Member] | U.S. Government and Agency Obligations [Member]
   
Available-for-sale securities, Amortized Cost 2,319 2,214
Available-for-sale securities, Gross Unrealized Gains 54 28
Available-for-sale securities, Gross Unrealized Losses 0 (8)
Available-for-sale securities, Fair Value 2,373 2,234
Available-For-Sale [Member] | State and Municipal Obligations [Member]
   
Available-for-sale securities, Amortized Cost 6,363 6,007
Available-for-sale securities, Gross Unrealized Gains 403 183
Available-for-sale securities, Gross Unrealized Losses (1) (42)
Available-for-sale securities, Fair Value 6,765 6,148
Available-For-Sale [Member] | Corporate Obligations [Member]
   
Available-for-sale securities, Amortized Cost 5,825 5,111
Available-for-sale securities, Gross Unrealized Gains 205 210
Available-for-sale securities, Gross Unrealized Losses (23) (11)
Available-for-sale securities, Fair Value 6,007 5,310
Available-For-Sale [Member] | U.S. Agency Mortgage-Backed Securities [Member]
   
Available-for-sale securities, Amortized Cost 2,279 1,851
Available-for-sale securities, Gross Unrealized Gains 74 58
Available-for-sale securities, Gross Unrealized Losses 0 (6)
Available-for-sale securities, Fair Value 2,353 1,903
Available-For-Sale [Member] | Non-U.S. Agency Mortgage-Backed Securities [Member]
   
Available-for-sale securities, Amortized Cost 476 439
Available-for-sale securities, Gross Unrealized Gains 28 26
Available-for-sale securities, Gross Unrealized Losses 0 0
Available-for-sale securities, Fair Value 504 465
Available-For-Sale [Member] | Equity Securities [Member]
   
Available-for-sale securities, Amortized Cost 529 508
Available-for-sale securities, Gross Unrealized Gains 23 22
Available-for-sale securities, Gross Unrealized Losses (8) (14)
Available-for-sale securities, Fair Value 544 516
Held-to-Maturity [Member]
   
Held-to-maturity securities, Amortized Cost 197 203
Held-to-maturity securities, Gross Unrealized Gains 7 5
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity securities, Fair Value 204 208
Held-to-Maturity [Member] | U.S. Government and Agency Obligations [Member]
   
Held-to-maturity securities, Amortized Cost 166 167
Held-to-maturity securities, Gross Unrealized Gains 7 5
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity securities, Fair Value 173 172
Held-to-Maturity [Member] | State and Municipal Obligations [Member]
   
Held-to-maturity securities, Amortized Cost 13 15
Held-to-maturity securities, Gross Unrealized Gains 0 0
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity securities, Fair Value 13 15
Held-to-Maturity [Member] | Corporate Obligations [Member]
   
Held-to-maturity securities, Amortized Cost 18 21
Held-to-maturity securities, Gross Unrealized Gains 0 0
Held-to-maturity securities, Gross Unrealized Losses 0 0
Held-to-maturity securities, Fair Value $ 18 $ 21