Debt (Details) $ in Millions	6 Months Ended
	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Balance as of beginning-of-year	$ 6,625
Notes issued	297
Repayment of notes	(300)
Unamortized premiums (discounts)	(1)
Unamortized debt issuance costs	(1)
Unamortized adjustments from discontinued hedges	(7)
Fair value hedge on interest rate swap agreements	(118)
Balance as of end-of-period	6,498
3.40% Notes [Member]
Debt Instrument [Line Items]
Notes issued	$ 300
Interest rate	0.034%
4.20% Notes [Member]
Debt Instrument [Line Items]
Repayment of notes	$ (300)
Interest rate	4.20%