Share-Based Compensation - Nonvested Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Number of Restricted Stock Shares (in thousands)
Granted (in shares)	600
Weighted Average Grant-Date Fair Value per Share
Granted (in shares)	600
Restricted Stock
Number of Restricted Stock Shares (in thousands)
Beginning balance (in shares)	2,946,000	3,317,000	3,236,000
Granted (in shares)	3,561,000	1,477,000	1,869,000
Vested (in shares)	(1,942,000)	(1,541,000)	(1,619,000)
Forfeited (in shares)	(269,000)	(307,000)	(169,000)
Ending balance (in shares)	4,296,000	2,946,000	3,317,000
Weighted Average Grant-Date Fair Value per Share
Weighted average beginning balance (in dollars per share)	$ 117.14	$ 101.72	$ 82.73
Granted (in dollars per share)	110.96	126.98	115.28
Vested (in dollars per share)	112.39	93.94	78.07
Forfeited (in dollars per share)	114.88	118.23	101.47
Weighted average ending balance (in dollars per share)	$ 114.31	$ 117.14	$ 101.72
Granted (in shares)	3,561,000	1,477,000	1,869,000
Time Based Restricted Units
Number of Restricted Stock Shares (in thousands)
Granted (in shares)	1,191	1,067	1,196
Weighted Average Grant-Date Fair Value per Share
Granted (in shares)	1,191	1,067	1,196
Total fair value of restricted stock vested under all restricted stock plans	$ 150	$ 191	$ 184