Noncontrolling Interests (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Noncontrolling Interests:
Noncontrolling interest ownership threshold (percentage)	100.00%		100.00%
Net income attributable to noncontrolling interest	$ 66	$ 56	$ 121	$ 112
Common Noncontrolling Interest [Member]
Noncontrolling Interests:
Ownership percentage held by noncontrolling interest (percentage)	8.00%	10.00%	8.00%	10.00%
Net income attributable to noncontrolling interest	$ 28	$ 18	$ 45	$ 36
Purchase of noncontrolling interest (shares)	681,553	1,232,029	1,051,028	1,315,445
Purchase of noncontrolling interest (price per share)	$ 295.31	$ 326.50	$ 312.38	$ 326.38
Purchase price of noncontrolling interest	$ 201	$ 402	$ 328	$ 429
Preferred Noncontrolling Interest [Member]
Noncontrolling Interests:
Distributions to noncontrolling interest	37	37	75	75
Noncontrolling Interest [Member]
Noncontrolling Interests:
Impact Of Change In Subsidiary Ownership Structure	(23)	(123)	(43)	(166)
Noncontrolling Interest [Member] \| Common Noncontrolling Interest [Member]
Noncontrolling Interests:
Carrying value of noncontrolling interst purchased	(164)	(271)	(254)	(290)
Additional Paid-in Capital [Member]
Noncontrolling Interests:
Impact Of Change In Subsidiary Ownership Structure	18	75	32	102
Additional Paid-in Capital [Member] \| Common Noncontrolling Interest [Member]
Noncontrolling Interests:
Impact of noncontrolling interest purchased	$ (28)	$ (81)	$ (56)	$ (86)

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Gross purchase price related to the decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Ownership percentage threshold for consolidated subsidiaries owned by the Company to be classified as a noncontrolling interest.

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Number of shares purchased from noncontrolling shareholders resulting in a decrease in noncontrolling interests during the period.

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Price per share of shares purchased from noncontrolling shareholders resulting in a decrease in noncontrolling interests during the period.

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Decrease in noncontrolling interest balance from payment of dividends or other distributions by the non-wholly owned subsidiary or partially owned entity, included in the consolidation of the parent entity, to the noncontrolling interest holders.

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Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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