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Lease Accounting - Cash flow (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Net cash provided by operating activities	$ 11,162	$ 7,361	$ 8,056
Lease assets obtained in exchange for new finance lease liabilities	9	0
Lease assets obtained in exchange for new operating lease liabilities	9	42
Operating Leases [Member]
Lessee, Lease, Description [Line Items]
Net cash provided by operating activities	$ (147)	$ (117)

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Amount of increase in right-of-use asset obtained in exchange for finance lease liability.

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