Income Tax (Interest Accrued Related to Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Examination [Line Items]
Interest expense (benefit) recognized on the consolidated statements of operations (1)	$ (36)	$ 12	$ (179)
Interest included in other liabilities on the consolidated balance sheets	15	$ 51
Operating Expense
Income Tax Examination [Line Items]
Interest expense (benefit) recognized on the consolidated statements of operations (1)	10		60
Current Income Tax Payable
Income Tax Examination [Line Items]
Interest expense (benefit) recognized on the consolidated statements of operations (1)	$ 26		$ 119