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Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income Balances (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Changes in Accumulated Balances        
AOCI tax, beginning balance $ 1 $ 1 $ 0 $ 4
AOCI, net of tax, beginning balance 142 (54) 110 (61)
Other comprehensive income (loss) before reclassifications, tax (1) 0 0 (3)
Other comprehensive income (loss) before reclassifications, net of tax (56) (14) 26 (24)
Amount of gain reclassified from accumulated other comprehensive income, net of tax 0 0 0 0
Amount of gain reclassified from accumulated other comprehensive income, net of tax 62 (23) 112 (40)
Net current period other comprehensive income, tax (1) 0 0 (3)
Other comprehensive income (loss), net of tax (118) 9 (86) 16
AOCI tax, ending balance 0 1 0 1
AOCI, net of tax, ending balance 24 (45) 24 (45)
Unrealized Gains (Losses) on Cash Flow Hedges        
Changes in Accumulated Balances        
AOCI before tax, beginning balance 190 (81) 126 (91)
Other comprehensive income (loss) before reclassifications, before tax (62) (12) 52 (19)
Amount of gain reclassified from accumulated other comprehensive income, before tax 62 (23) 112 (40)
Net current period other comprehensive income, before tax (124) 11 (60) 21
AOCI before tax, ending balance 66 (70) 66 (70)
Unrealized Gains (Losses) on Investments        
Changes in Accumulated Balances        
AOCI before tax, beginning balance 0 0 0  
Other comprehensive income (loss) before reclassifications, before tax (2) 0 (2)  
Amount of gain reclassified from accumulated other comprehensive income, before tax 0 0 0  
Net current period other comprehensive income, before tax (2) 0 (2)  
AOCI before tax, ending balance (2) 0 (2) 0
Foreign Currency Translation        
Changes in Accumulated Balances        
AOCI before tax, beginning balance (49) 26 (16) 26
Other comprehensive income (loss) before reclassifications, before tax 9 (2) (24) (2)
Amount of gain reclassified from accumulated other comprehensive income, before tax 0 0 0 0
Net current period other comprehensive income, before tax 9 (2) (24) (2)
AOCI before tax, ending balance $ (40) $ 24 $ (40) $ 24