Hedging Transactions and Derivative Financial Instruments (Summary of Notional Values and Pretax Impact in Fair Values) (Details) - USD ($) $ in Millions			12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Derivative and nonderivative, original notional amount	$ 13,358	$ 12,298	$ 13,358	$ 12,298
Derivative and nonderivative, notional amount	10,883	10,573	10,883	10,573
Gain (loss) recognized in OCI on derivatives and nonderivatives			986	(954)
Reclassification from AOCI			(222)	407	$ 172
Net investment hedging | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, original notional amount	3,875	2,875	3,875	2,875
Derivative, notional amount outstanding	3,000	2,000	3,000	2,000
Gain (loss) recognized in OCI on derivatives and nonderivatives			130	(104)
Reclassification from AOCI			0	0
Net investment hedging | Foreign currency denominated debt
Derivative Instruments, Gain (Loss) [Line Items]
Nonderivative hedging instruments	3,883	4,573
Gain (loss) recognized in OCI on nonderivatives			333	(418)
Reclassification from AOCI			0	0
Cash flow hedging | Foreign currency contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, original notional amount	4,000	4,000	4,000	4,000
Derivative, notional amount outstanding	4,000	4,000	4,000	4,000
Gain (loss) recognized in OCI on derivatives and nonderivatives			542	(432)
Reclassification from AOCI			(283)	359
Cash flow hedging | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, original notional amount	1,600	850	1,600	850
Derivative, notional amount outstanding	$ 0	$ 0	0	0
Gain (loss) recognized in OCI on derivatives and nonderivatives			(19)	0
Reclassification from AOCI			3	2
Cash Flow and Net Investment Hedges
Derivative Instruments, Gain (Loss) [Line Items]
Reclassification from AOCI			$ (280)	$ 361