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Summary of Significant Accounting Policies - Schedule of Maturities of Lease Liabilities Related to Operating Leases (Details)
$ in Millions
Mar. 31, 2019
USD ($)
Accounting Policies [Abstract]  
2019 (excluding the fiscal first quarter ended March 31, 2019) $ 198
2020 222
2021 177
2022 126
2023 81
After 2023 194
Total lease payments 998
Less: Interest 93
Present Value of lease liabilities $ 905