Equity - Dividends and Stock Repurchases (Details) $ / shares in Units, $ in Millions			3 Months Ended			6 Months Ended
	Feb. 28, 2022 $ / shares	Jan. 26, 2022 $ / shares	Jun. 30, 2022 $ / shares	Mar. 31, 2022 USD ($) transaction agreement $ / shares shares	Mar. 31, 2021 USD ($)	Jul. 27, 2020 USD ($)	Jan. 29, 2020 shares	Dec. 04, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly dividend rate (USD per share) | $ / shares	$ 0.85	$ 0.77		$ 0.77
Total Cash Utilized | $				$ 7,003	$ 0
Uncapped ASR, March 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ARS agreement transactions | transaction				2
Number of agreements | agreement				3
Stock repurchased during period (shares)				15,200,000
Total Cash Utilized | $				$ 7,000		$ 7,000
Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly dividend rate (USD per share) | $ / shares			$ 0.85
2020 Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized for repurchase (shares)							30,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)							12.00%
Remaining shares available under repurchase program (shares)				15,500,000
2013 Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized for repurchase (shares)								50,000,000
Shares authorized for repurchase, compared to total common stock outstanding (as a percent)								18.00%