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Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance $ (127) $ (17) $ (26) $ (127) $ (30) [1] $ (127)
Other comprehensive income (loss) before reclassifications   32 6   55 69
Amounts reclassified from accumulated other comprehensive income (loss)   (25) 1   (35) 16
Total other comprehensive income (loss), net of tax   7 7   20 85
Ending balance (104) (10) (19) (26) (10) (19)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance (8) 2 (8) (8) (1) (8)
Other comprehensive income (loss) before reclassifications   1 1   4 1
Amounts reclassified from accumulated other comprehensive income (loss)   (1) 0   (1) 0
Total other comprehensive income (loss), net of tax   0 1   3 1
Ending balance (8) 2 (7) (8) 2 (7)
Unrealized Gains (Losses) on Derivative Instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance (89) 31 27 (89) 22 (89)
Other comprehensive income (loss) before reclassifications   40 2   59 80
Amounts reclassified from accumulated other comprehensive income (loss)   (24) 1   (34) 16
Total other comprehensive income (loss), net of tax   16 3   25 96
Ending balance (66) 47 30 27 47 30
Foreign Currency Translation Adjustment [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Beginning balance (30) (50) (45) (30) (51) (30)
Other comprehensive income (loss) before reclassifications   (9) 3   (8) (12)
Amounts reclassified from accumulated other comprehensive income (loss)   0 0   0 0
Total other comprehensive income (loss), net of tax   (9) 3   (8) (12)
Ending balance (30) $ (59) $ (42) $ (45) $ (59) $ (42)
Accounting Standards Update 2014-09 [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Other comprehensive income (loss) before reclassifications 22          
Accounting Standards Update 2014-09 [Member] | Unrealized Gains (Losses) on Derivative Instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Other comprehensive income (loss) before reclassifications 22          
ASU 2018-02 [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Amounts reclassified from accumulated other comprehensive income (loss) 1          
ASU 2018-02 [Member] | Unrealized Gains (Losses) on Derivative Instruments [Member]            
Accumulated Other Comprehensive Income (Loss) [Roll Forward]            
Amounts reclassified from accumulated other comprehensive income (loss) $ 1          
[1] Derived from audited Consolidated Financial Statements.