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Investment Securities (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available for Sale Securities by Type    
Cost $ 4,695 $ 4,935
Gross Unrealized Gains 165 165
Gross Unrealized Losses (5) (84)
Estimated Fair Value 4,855 5,016
U.S. States and Political Subdivisions Debt Securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 3,814 4,060
Gross Unrealized Gains 125 54
Gross Unrealized Losses (4) (79)
Estimated Fair Value 3,935 4,035
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 346 318
Gross Unrealized Gains 4 3
Gross Unrealized Losses 0 (1)
Estimated Fair Value 350 320
Corporate debt securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 44 43
Gross Unrealized Gains 2 3
Gross Unrealized Losses 0 0
Estimated Fair Value 46 46
Mortgage-backed securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 144 160
Gross Unrealized Gains 7 5
Gross Unrealized Losses 0 (1)
Estimated Fair Value 151 164
Equity securities [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 6 29
Gross Unrealized Gains 18 95
Gross Unrealized Losses 0 0
Estimated Fair Value 24 124
Foreign government bonds and obligations [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 288 272
Gross Unrealized Gains 9 5
Gross Unrealized Losses 0 (1)
Estimated Fair Value 297 276
Availabe For Sale Securities Other [Member]
   
Schedule of Available for Sale Securities by Type    
Cost 50 50
Gross Unrealized Gains 0 0
Gross Unrealized Losses (1) (2)
Estimated Fair Value $ 49 $ 48