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Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 153	$ 155	$ 139
Operating cash flows from finance leases	23	21	8
Financing cash flows from finance leases	161	187	37
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	197	46	441
Finance leases	$ 231	$ 399	$ 288

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

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Amount of interest paid on finance lease liability.

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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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