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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets    
Available-for-sale securities $ 1,611 $ 1,586
Recurring basis
    
Assets    
Available-for-sale securities 1,611 1,586
Derivative financial instruments, net 186 154
Total Assets 1,797 1,740
Liabilities    
Guarantees 15 14
Total Liabilities 15 14
U.S. treasury bonds
    
Assets    
Available-for-sale securities 11 10
U.S. treasury bonds | Recurring basis
    
Assets    
Available-for-sale securities 11 10
Other U.S. and non-U.S. government bonds
    
Assets    
Available-for-sale securities 126 146
Other U.S. and non-U.S. government bonds | Recurring basis
    
Assets    
Available-for-sale securities 126 146
Corporate bonds
    
Assets    
Available-for-sale securities 672 664
Corporate bonds | Recurring basis
    
Assets    
Available-for-sale securities 672 664
Asset-backed Securities
    
Assets    
Available-for-sale securities 75 96
Asset-backed Securities | Recurring basis
    
Assets    
Available-for-sale securities 75 96
U.S. governmental agency | Recurring basis
    
Assets    
Available-for-sale securities 337 299
Residential
    
Assets    
Available-for-sale securities 21 25
Residential | Recurring basis
    
Assets    
Available-for-sale securities 21 25
Commercial
    
Assets    
Available-for-sale securities 93 127
Commercial | Recurring basis
    
Assets    
Available-for-sale securities 93 127
Large capitalization value
    
Assets    
Available-for-sale securities 231 185
Large capitalization value | Recurring basis
    
Assets    
Available-for-sale securities 231 185
Smaller company growth
    
Assets    
Available-for-sale securities 45 34
Smaller company growth | Recurring basis
    
Assets    
Available-for-sale securities 45 34
Level 1 | Recurring basis
    
Assets    
Available-for-sale securities 287 229
Derivative financial instruments, net 0 0
Total Assets 287 229
Liabilities    
Guarantees 0 0
Total Liabilities 0 0
Level 1 | U.S. treasury bonds | Recurring basis
    
Assets    
Available-for-sale securities 11 10
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | Corporate bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | Asset-backed Securities | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | U.S. governmental agency | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | Residential | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | Commercial | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 1 | Large capitalization value | Recurring basis
    
Assets    
Available-for-sale securities 231 185
Level 1 | Smaller company growth | Recurring basis
    
Assets    
Available-for-sale securities 45 34
Level 2 | Recurring basis
    
Assets    
Available-for-sale securities 1,324 1,357
Derivative financial instruments, net 186 154
Total Assets 1,510 1,511
Liabilities    
Guarantees 0 0
Total Liabilities 0 0
Level 2 | U.S. treasury bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis
    
Assets    
Available-for-sale securities 126 146
Level 2 | Corporate bonds | Recurring basis
    
Assets    
Available-for-sale securities 672 664
Level 2 | Asset-backed Securities | Recurring basis
    
Assets    
Available-for-sale securities 75 96
Level 2 | U.S. governmental agency | Recurring basis
    
Assets    
Available-for-sale securities 337 299
Level 2 | Residential | Recurring basis
    
Assets    
Available-for-sale securities 21 25
Level 2 | Commercial | Recurring basis
    
Assets    
Available-for-sale securities 93 127
Level 2 | Large capitalization value | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 2 | Smaller company growth | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Derivative financial instruments, net 0 0
Total Assets 0 0
Liabilities    
Guarantees 15 14
Total Liabilities 15 14
Level 3 | U.S. treasury bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Corporate bonds | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Asset-backed Securities | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | U.S. governmental agency | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Residential | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Commercial | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Large capitalization value | Recurring basis
    
Assets    
Available-for-sale securities 0 0
Level 3 | Smaller company growth | Recurring basis
    
Assets    
Available-for-sale securities $ 0 $ 0