Income Taxes (Narrative) (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Net income tax payments/(refunds)		$ (1,480)	$ 37	$ 837
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount	[1]		(587)	(371)
Unrecognized tax benefits that would affect the effective tax rate, if recognized		790	734	$ 1,287
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		671
Valuation allowance		2,423	$ 3,094
Continuing Operations [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance		512
Other Comprehensive Income (Loss) [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation allowance		1,206
Federal Benefit of State Impacts [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		$ (23)

[1] n 2021, 2020 and 2019, we recorded excess tax benefits related to employee share-based payments of $6, $82 and $180, respectively.