Long-Term Debt and Common Stock (Details) $ / shares in Units, shares in Millions				3 Months Ended		6 Months Ended
	Aug. 08, 2023 $ / shares	May 04, 2023 $ / shares	Feb. 23, 2023 $ / shares	Jun. 30, 2023 USD ($) extension $ / shares shares	Jun. 30, 2022 $ / shares	Jun. 30, 2023 USD ($) extension $ / shares shares	Jun. 30, 2022 $ / shares	Jun. 07, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2021 USD ($)
Debt Instrument Table [Line Items]
Stock repurchase program, authorized amount										$ 5,000,000,000
Stock repurchased during period, shares | shares				2.8		5.7
Stock repurchased during period, value				$ 300,000,000		$ 610,000,000
Stock repurchase program, remaining authorized repurchase amount				4,400,000,000		4,400,000,000
Estimated federal excise taxes				$ 5,000,000		$ 5,000,000
Common stock dividends declared (in USD per share) | $ / shares		$ 0.825	$ 0.825	$ 0.825	$ 2.55	$ 2.65	$ 4.30
Special cash dividend declared (in USD per share) | $ / shares			$ 1.00
Subsequent Event
Debt Instrument Table [Line Items]
Common stock dividends declared (in USD per share) | $ / shares	$ 0.825
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument Table [Line Items]
Debt instrument, face amount								$ 2,000,000,000
Line of credit facility, maximum borrowing capacity				$ 1,900,000,000		$ 1,900,000,000		$ 1,900,000,000
Line of credit facility, maturity term extensions | extension				2		2
Line of credit facility, extension period				1 year		1 year
Line of credit facility, extension threshold						0.50
Line of credit facility increase additional borrowings (not to exceed)						$ 3,000,000,000
Maximum total debt to total capitalization ratio allowed under financial covenant				65.00%		65.00%
Borrowings outstanding				$ 0		$ 0
Revolving Credit Agreement | Revolving Credit Facility | Eurodollar
Debt Instrument Table [Line Items]
Weighted average interest rate (in hundredths)						6.14%
Revolving Credit Agreement | Revolving Credit Facility | Base Rate
Debt Instrument Table [Line Items]
Weighted average interest rate (in hundredths)						8.25%
Revolving Credit Agreement | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR)
Debt Instrument Table [Line Items]
Debt Instrument, basis spread on base rate (as a percent)						0.10%
Commercial Paper
Debt Instrument Table [Line Items]
Line of credit facility, current borrowing capacity				0		$ 0			$ 0
Senior Notes | 2.625% Senior Notes due 2023
Debt Instrument Table [Line Items]
Debt instrument, face amount				$ 1,250,000,000		$ 1,250,000,000
Debt instrument, interest rate (as a percent)				2.625%		2.625%