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Summary of Significant Accounting Policies - Leases (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |
Renewal term | 20 years
Lease, option to terminate | 60 days
Lease liability | $ 586
Right of use asset | 483
Lease, cost | 171
Variable lease, cost | $ 30
Weighted average remaining lease term (years) | 6 years
Weighted average discount rate | 3.15%
2020 | $ 133
2021 | 121
2022 | 102
2023 | 84
2024 | 67
Thereafter | 137
Total lease payments | 644
Less: interest | (58)
Present value of lease liabilities | $ 586
Minimum |
Lessee, Lease, Description [Line Items] |
Lease, term of contract | 1 year
Maximum |
Lessee, Lease, Description [Line Items] |
Lease, term of contract | 10 years

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