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Leases Lessee Disclosure - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Disclosure of Cash Flow Information
Operating cash flows from operating leases	$ 165	$ 162
Operating cash flows from finance leases	2	2
Financing cash flows from finance leases	14	15
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	103	153
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 11	$ 18	$ 20

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Amount of interest paid on finance lease liability.

+ References

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