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Loans Payable, Long-Term Debt and Leases Loans Payable, Long-Term Debt and Leases - Maturity Schedule (Details) $ in Millions	Jun. 30, 2019 USD ($)
Loans Payable, Long-Term Debt and Leases [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 138
2020	232
2021	172
2022	146
2023	98
Thereafter	339
Total lease payments	1,125
Less: imputed interest	(132)
Operating lease liability	$ 993

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Loans Payable, Long-Term Debt and Leases [Abstract]

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

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-Publisher FASB
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-SubTopic 20
-Section 50
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