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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income $ 214 $ 3,076 $ 500 $ 3,358
Other comprehensive income (loss), net of tax:        
Net unrealized gains (losses) on available-for-sale marketable securities [net of tax (provision) benefit of ($2), $8, ($3) and ($7), respectively] 4 (13) 1 13
Reclassification adjustment for net losses (gains) on available-for-sale marketable securities included in investment and other income, net [net of tax (benefit) provision of ($3), $1, ($3) and $17, respectively] 8 (2) 9 (28)
Other comprehensive income (loss) 12 (15) 10 (15)
Comprehensive income $ 226 $ 3,061 $ 510 $ 3,343