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Warranty (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Warranty liability    
Balance at January 1 $ 102 $ 107
Accruals of warranties issued during the period 17 28
Accruals related to pre-existing warranties 5 8
Settlements made (in cash or kind) during the period (20) (38)
Other, net (3) (3)
Balance at end of period $ 101 $ 102