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Other Assets - Equity Method Investments and Leases - Lease Costs (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Fixed costs $ 852 $ 762 $ 670
Variable costs 187 154 152
Less: Sublease income (6) (5) (6)
Total lease cost, net $ 1,033 $ 911 $ 816