Stockholders' Equity and Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions			1 Months Ended	12 Months Ended
	Jul. 22, 2022 USD ($) shares	Apr. 15, 2022 $ / shares shares	May 31, 2020 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) day $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Jul. 16, 2013 shares
Repurchase of common stock authorized, shares | shares							20,000,000
Stock repurchase program, remaining number of shares authorized to be repurchased, shares | shares				20,000,000
Proceeds from the public offering of common stock, net of issuance costs				$ 0	$ 0	$ 1,729
Proceeds from the public offering of preferred stock, net of issuance costs				0	0	1,668
Aggregate intrinsic value of options exercised				288	446	415
Cash receipts due to exercise of options				130	167	211
Employee service share-based compensation, tax benefit from exercise of stock options				85	118	110
Tax benefit				$ 61	$ 95	$ 85
Aggregate number of shares withheld to satisfy tax requirement | shares				362,000	346,000
Aggregate value of shares withheld to satisfy tax requirement				$ 99	$ 81
2007 Omnibus Incentive Plan
Total number of authorized shares to be issued under the 2007 Omnibus Incentive Plan, shares | shares				127,000,000
Common shares reserved for issuance under the 2007 Omnibus Incentive Plan, shares | shares				45,000,000
Stock options
Total unrecognized compensation cost				$ 240
Weighted average period for cost to be recognized (in years)				2 years
Weighted average grant date fair value (in usd per share) | $ / shares				$ 80.32	$ 64.57	$ 37.42
Employee service share-based compensation, tax benefit from exercise of stock options				$ 48	$ 83	$ 82
Stock options | 2007 Omnibus Incentive Plan
Vesting period				5 years
Stock option term (in years)				10 years
Stock options | Amended and Restated 2007 Omnibus Incentive Plan
Vesting period				4 years
Stock option term (in years)				10 years
RSUs
Total unrecognized compensation cost				$ 204
Weighted average period for cost to be recognized (in years)				2 years
Employee service share-based compensation, tax benefit from exercise of stock options				$ 37	$ 35	$ 18
RSUs | 2007 Omnibus Incentive Plan
Vesting period				5 years
RSUs | Amended and Restated 2007 Omnibus Incentive Plan
Vesting period				4 years
Common stock
Shares repurchased (in shares) | shares	3,906
Stock repurchased	$ 1
Issuance of stock | shares			10,900,000
Shares issued, price per share | $ / shares			$ 163.00
Series A Preferred Stock
Preferred stock, dividend rate, percentage				4.75%	4.75%
Preferred stock, shares issued (in shares) | shares				0	1,650,000
Series A Preferred Stock | Minimum
Convertible preferred stock, shares issued upon conversion (in shares) | shares		6.6632
Series B Preferred Stock
Preferred stock, dividend rate, percentage			5.00%	5.00%	5.00%
Payments of stock issuance costs			$ 49
Preferred stock, shares issued (in shares) | shares			1,720,000	1,720,000	1,720,000
Preferred stock, liquidation preference per share | $ / shares			$ 1,000
Proceeds from the public offering of preferred stock, net of issuance costs			$ 1,700
Series B Preferred Stock | Minimum
Convertible preferred stock, shares issued upon conversion (in shares) | shares				5.0156
Series B Preferred Stock | Maximum
Convertible preferred stock, shares issued upon conversion (in shares) | shares				6.1441
Common stock
Issuance of stock | shares				0	0	10,900,000
Proceeds from the public offering of common stock, net of issuance costs			1,700
Payments of stock issuance costs			$ 54
Threshold consecutive trading days | day				20
Preferred stock
Issuance of stock | shares				0	0	1,700,000
Preferred stock | Series A Preferred Stock
Preferred stock, dividend rate, percentage		4.75%
Common stock issued in connection with MCPS and LYONs conversions | shares		11,000,000
Dividends | $ / shares		$ 11.875