Financial Instruments - Cumulative Basis Adjustments for Fair Value Hedges (Details) - Long-term debt [Member] - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Carrying Amount of Hedged Assets Liabilities	[1]	$ 2,233	$ 2,016
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Active Hedging Relationships, Liability		16	117
Cumulative Amount of Fair Value Hedging Adjustment Increase/(Decrease) to Carrying Amount, Discontinued Hedging Relationships, Liability		$ 1,154	$ 1,149

[1] Carrying amounts exclude the cumulative amount of fair value hedging adjustments.