Debt (Details) - Debt Issuance - USD ($) $ in Millions				12 Months Ended
	Jun. 08, 2021	Apr. 27, 2020	Mar. 04, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument
Net proceeds of issuance, after the deduction of the underwriting discount and expenses				$ 739	$ 490	$ 492
Senior Notes [Member] | 3.050% Senior notes due June 8, 2051 [Member]
Debt Instrument
Debt, principal amount	$ 750
Interest rate (percent)	3.05%			3.05%
Net proceeds of issuance, after the deduction of the underwriting discount and expenses	$ 739
Percentage of principal amount at which redemption price may be set	100.00%
Basis points added to current Treasury rate used in calculation of alternative redemption price	0.15%
Senior Notes [Member] | 2.55% Senior notes due April 27, 2050 [Member]
Debt Instrument
Debt, principal amount		$ 500
Interest rate (percent)		2.55%		2.55%
Net proceeds of issuance, after the deduction of the underwriting discount and expenses		$ 490
Percentage of principal amount at which redemption price may be set		100.00%
Basis points added to current Treasury rate used in calculation of alternative redemption price		0.25%
Senior Notes [Member] | 4.10% Senior notes due March 4, 2049 [Member]
Debt Instrument
Debt, principal amount			$ 500
Interest rate (percent)			4.10%	4.10%	4.10%
Net proceeds of issuance, after the deduction of the underwriting discount and expenses			$ 492
Percentage of principal amount at which redemption price may be set			100.00%
Basis points added to current Treasury rate used in calculation of alternative redemption price			0.20%