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Goodwill and Intangible Assets, Net - Narrative - Intangible Assets (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]      
Accumulated goodwill impairment losses $ 290   $ 290
Amortization expense of intangible assets 121 $ 115  
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]      
Estimated annual amortization expense, remainder of 2018 328    
Estimated annual amortization expense, 2019 420    
Estimated annual amortization expense, 2020 405    
Estimated annual amortization expense, 2021 393    
Estimated annual amortization expense, 2022 361    
Estimated annual amortization expense, thereafter $ 2,331