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Commitments and Contingencies - Operating Leases (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Long-term Purchase Commitment [Line Items]    
Rent expense $ 96 $ 182
Operating lease right of use asset obtained in exchange for lease liability   163
Operating lease payments for the remainder of 2019 140 140
2020 242 242
2021 214 214
2022 147 147
2023 133 133
Thereafter 342 342
Imputed interest $ 163 $ 163
Weighted average discount rate 4.50% 4.50%
Operating lease weighted-average remaining lease term 6 years 6 years
Operating lease payments   $ 175
Future lease obligation amount $ 379 379
Other assets [Member]    
Long-term Purchase Commitment [Line Items]    
Operating lease right-of-use assets 956 956
Accrued Liabilities [Member]    
Long-term Purchase Commitment [Line Items]    
Current operating lease liability 231 231
Other liabilities [Member]    
Long-term Purchase Commitment [Line Items]    
Noncurrent operating lease liability $ 824 $ 824