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Fair value disclosures (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Assets      
Available-for-sale securities $ 1,570 $ 1,586 $ 1,447
Recurring basis
      
Assets      
Available-for-sale securities 1,570 1,586 1,447
Derivative financial instruments, net 161 154 145
Total Assets 1,731 1,740 1,592
Liabilities      
Guarantees 13 14 7
Total Liabilities 13 14 7
U.S. treasury bonds
      
Assets      
Available-for-sale securities 10 10 10
U.S. treasury bonds | Recurring basis
      
Assets      
Available-for-sale securities 10 10 10
Other U.S. and non-U.S. government bonds
      
Assets      
Available-for-sale securities 120 146 92
Other U.S. and non-U.S. government bonds | Recurring basis
      
Assets      
Available-for-sale securities 120 146 92
Corporate bonds
      
Assets      
Available-for-sale securities 633 664 572
Corporate bonds | Recurring basis
      
Assets      
Available-for-sale securities 633 664 572
Asset-backed securities
      
Assets      
Available-for-sale securities 72 96 111
Asset-backed securities | Recurring basis
      
Assets      
Available-for-sale securities 72 96 111
U.S. governmental agency | Recurring basis
      
Assets      
Available-for-sale securities 321 299 310
Residential
      
Assets      
Available-for-sale securities 18 25 30
Residential | Recurring basis
      
Assets      
Available-for-sale securities 18 25 30
Commercial
      
Assets      
Available-for-sale securities 93 127 145
Commercial | Recurring basis
      
Assets      
Available-for-sale securities 93 127 145
Large capitalization value
      
Assets      
Available-for-sale securities 254 185 148
Large capitalization value | Recurring basis
      
Assets      
Available-for-sale securities 254 185 148
Smaller company growth
      
Assets      
Available-for-sale securities 49 34 29
Smaller company growth | Recurring basis
      
Assets      
Available-for-sale securities 49 34 29
Level 1 | Recurring basis
      
Assets      
Available-for-sale securities 313 229 187
Derivative financial instruments, net 0 0 0
Total Assets 313 229 187
Liabilities      
Guarantees 0 0 0
Total Liabilities 0 0 0
Level 1 | U.S. treasury bonds | Recurring basis
      
Assets      
Available-for-sale securities 10 10 10
Level 1 | Other U.S. and non-U.S. government bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | Corporate bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | Asset-backed securities | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | U.S. governmental agency | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | Residential | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | Commercial | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 1 | Large capitalization value | Recurring basis
      
Assets      
Available-for-sale securities 254 185 148
Level 1 | Smaller company growth | Recurring basis
      
Assets      
Available-for-sale securities 49 34 29
Level 2 | Recurring basis
      
Assets      
Available-for-sale securities 1,257 1,357 1,260
Derivative financial instruments, net 161 154 145
Total Assets 1,418 1,511 1,405
Liabilities      
Guarantees 0 0 0
Total Liabilities 0 0 0
Level 2 | U.S. treasury bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 2 | Other U.S. and non-U.S. government bonds | Recurring basis
      
Assets      
Available-for-sale securities 120 146 92
Level 2 | Corporate bonds | Recurring basis
      
Assets      
Available-for-sale securities 633 664 572
Level 2 | Asset-backed securities | Recurring basis
      
Assets      
Available-for-sale securities 72 96 111
Level 2 | U.S. governmental agency | Recurring basis
      
Assets      
Available-for-sale securities 321 299 310
Level 2 | Residential | Recurring basis
      
Assets      
Available-for-sale securities 18 25 30
Level 2 | Commercial | Recurring basis
      
Assets      
Available-for-sale securities 93 127 145
Level 2 | Large capitalization value | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 2 | Smaller company growth | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Derivative financial instruments, net 0 0 0
Total Assets 0 0 0
Liabilities      
Guarantees 13 14 7
Total Liabilities 13 14 7
Level 3 | U.S. treasury bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Other U.S. and non-U.S. government bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Corporate bonds | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Asset-backed securities | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | U.S. governmental agency | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Residential | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Commercial | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Large capitalization value | Recurring basis
      
Assets      
Available-for-sale securities 0 0 0
Level 3 | Smaller company growth | Recurring basis
      
Assets      
Available-for-sale securities $ 0 $ 0 $ 0