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Leases - Supplemental Cash Flow Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 139
Operating cash flows from finance leases	8
Financing cash flows from finance leases	37
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	441
Finance leases	$ 288

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Cash Flow, Lessee [Abstract]

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Right-Of-Use Asset Obtained In Exchange For Lease Liability [Abstract]

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- Definition

Amount of interest paid on finance lease liability.

+ References

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Amount of cash outflow for principal payment on finance lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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