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Summary of Significant Accounting Policies - Maturities of Operating Lease Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
2020	$ 62
2021	65
2022	63
2023	45
2024	41
Thereafter	100
Lease liability amounts repayable	376
Interest costs	42
Total operating lease liability	$ 334	$ 368

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
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