Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
Noncontrolling Interests:
Net income attributable to noncontrolling interest	$ 114	$ 71
Distributions to noncontrolling interest	39	39
Purchase of noncontrolling interest, net of tax	(429)	(344)
Change in noncontrolling interest ownership, net of tax	(44)	(27)
Common Noncontrolling Interest
Noncontrolling Interests:
Net income attributable to noncontrolling interest	$ 76	$ 33
Purchase of noncontrolling interest (shares)	792,654	795,607
Purchase of noncontrolling interest (price per share)	$ 639.27	$ 494.54
Purchase price of noncontrolling interest	$ 507	$ 393
Common Noncontrolling Interest \| A/N
Noncontrolling Interests:
Ownership percentage held by noncontrolling interest (percentage)	7.00%	8.00%
Preferred Noncontrolling Interest
Noncontrolling Interests:
Distributions to noncontrolling interest	$ 38	$ 38
Noncontrolling Interests
Noncontrolling Interests:
Distributions to noncontrolling interest	39	39
Purchase of noncontrolling interest, net of tax	(192)	(195)
Change in noncontrolling interest ownership, net of tax	(175)	(109)
Noncontrolling Interests \| Common Noncontrolling Interest
Noncontrolling Interests:
Purchase of noncontrolling interest, net of tax	(192)	(195)
Change in noncontrolling interest ownership, net of tax	(175)	(109)
Additional Paid-in Capital
Noncontrolling Interests:
Distributions to noncontrolling interest	0	0
Purchase of noncontrolling interest, net of tax	(237)	(149)
Change in noncontrolling interest ownership, net of tax	131	82
Additional Paid-in Capital \| Common Noncontrolling Interest
Noncontrolling Interests:
Impact of noncontrolling interest purchased	(237)	(149)
Change in noncontrolling interest ownership, net of tax	$ 131	$ 82
Maximum \| Charter
Noncontrolling Interests:
Minority Interest Ownership Percentage Threshold	100.00%

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