Allowance for Losses on Financial Assets Allowance for Losses on Financial Assets (Allowance Disclosure) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020
Allowance for Losses on Financial Assets [Line Items]
Accounts Receivable, Allowance for Credit Loss	$ (390)	$ (444)	$ (138)
Contract with Customer, Asset, Allowance for Credit Loss	(91)	(129)	(81)
Allowance for Credit Loss	(747)	(802)	(337)
Financing Receivable, Allowance for Credit Loss	(18)	(17)	(5)
Accounts Receivable, Credit Loss Expense (Reversal)	(24)	(314)
Contract with Customer, Asset, Credit Loss Expense (Reversal)	(11)	(48)
Credit Loss Expense, Reversal	(89)	(474)
Financing Receivable, Credit Loss, Expense (Reversal)	(1)	(12)
Accounts Receivable, Allowance for Credit Loss, Writeoff	77	8
Contract with Customer, Asset, Allowance for Credit Loss, Writeoff	49
Allowance for Credit Loss, Writeoff	143	8
Accounts Receivable, Asset, Allowance for Credit Loss, Recovery	1
Allowance for Credit Loss, Recoveries	1	1
Other Current Assets [Member]
Allowance for Losses on Financial Assets [Line Items]
Allowance for Credit Loss	(62)	(72)	(38)
Credit Loss Expense, Reversal	(6)	(34)
Allowance for Credit Loss, Writeoff	4
Other Noncurrent Assets [Member]
Allowance for Losses on Financial Assets [Line Items]
Allowance for Credit Loss	(186)	(140)	$ (75)
Credit Loss Expense, Reversal	(59)	(66)
Allowance for Credit Loss, Writeoff	$ 13
Other Assets, Net, Allowance for Credit Loss, Recovery		$ 1