Stock Compensation - Options Vested and Expected to Vest (Details) - Long-term incentive and director compensation plans - Employee Stock Option $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, vested and expected to vest (in shares) | shares	25	[1]
Weighted average remaining contractual life, vested and expected to vest (in years)	5 years 6 months	[1]
Weighted average exercise price per share, vested and expected to vest (in dollars per share) | $ / shares	$ 90.97	[1]
Intrinsic value, vested and expected to vest (millions of dollars)	$ 2,408	[1]
Outstanding options exercisable (in shares) | shares	16
Weighted average remaining contractual life, options exercisable	4 years 2 months 12 days
Weighted average exercise price per share, options exercisable (in dollars per share) | $ / shares	$ 69.43
Intrinsic value, options exercisable (millions of dollars)	$ 1,952
Aggregate intrinsic value of stock options outstanding, excluding the effects of expected forfeitures	$ 2,420

[1] Includes effects of expected forfeitures. Excluding the effects of expected forfeitures, the aggregate intrinsic value of stock options outstanding was $2.42 billion.