Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Payroll support and voluntary Employee programs, net	$ 0	$ 740	$ 0	$ 2,187
Other (gains) losses, net	(68)	14	(212)	61
Decrease in AOCI	11,120	9,688	11,120	9,688	$ 10,417	$ 10,414	$ 9,093	$ 8,876
Accumulated other comprehensive income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	805	136	805	136	891	388	(60)	(105)
Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI	$ 16,311	$ 15,260	$ 16,311	$ 15,260	$ 15,551	15,774	$ 14,912	14,777
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI						(245)		0
Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI								(19)
Cumulative Effect, Period of Adoption, Adjustment | Retained earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Decrease in AOCI						$ 55		$ 19