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Commitments and Contingencies Operating Leases (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
Long-term Purchase Commitment [Line Items]  
Rent expense $ 86
Operating lease right of use asset obtained in exchange for lease liability 122
Operating lease payments for the remainder of 2019 205
2020 240
2021 210
2022 144
2023 131
Thereafter 304
Imputed interest $ 160
Weighted average discount rate 4.40%
Operating lease weighted-average remaining lease term 5 years 9 months 18 days
Operating lease payments $ 81
Future lease obligation amount 339
Other assets [Member]  
Long-term Purchase Commitment [Line Items]  
Operating lease right-of-use assets 988
Accrued Liabilities [Member]  
Long-term Purchase Commitment [Line Items]  
Current operating lease liability 236
Other liabilities [Member]  
Long-term Purchase Commitment [Line Items]  
Noncurrent operating lease liability $ 838