v3.7.0.1
Other Comprehensive Income and Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance $ 60 $ 62
Other comprehensive income before reclassifications (15) (44)
Amounts reclassified from other comprehensive income (9) (14)
Net other comprehensive income (loss) (24) (58)
Ending balance 36 4
Defined Benefit Pension Plan [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (7) (10)
Other comprehensive income before reclassifications 0 2
Amounts reclassified from other comprehensive income 0 0
Net other comprehensive income (loss) 0 2
Ending balance (7) (8)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (1) (1)
Other comprehensive income before reclassifications 0 1
Amounts reclassified from other comprehensive income 1 1
Net other comprehensive income (loss) 1 2
Ending balance 0 1
Net Unrealized Gain (Loss) From Hedging Activities [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance 92 93
Other comprehensive income before reclassifications (15) (49)
Amounts reclassified from other comprehensive income (13) (15)
Net other comprehensive income (loss) (28) (64)
Ending balance 64 29
Accumulated Translation Adjustment [Member]    
Accumulated Other Comprehensive Income (Loss) [Roll Forward]    
Beginning balance (24) (20)
Other comprehensive income before reclassifications 0 2
Amounts reclassified from other comprehensive income 3 0
Net other comprehensive income (loss) 3 2
Ending balance $ (21) $ (18)