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Basis of Presentation, Uses of Estimates and Significant Accounting Policies Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest, beginning of period	$ 1,726
Acquisitions	40	$ 87	$ 521
Distributions	(277)	(279)	(228)
Fair value and other adjustments	197	316	163
Redeemable Noncontrolling Interest, end of period	2,211	1,726
Redeemable Noncontrolling Interests [Member]
Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest, beginning of period	1,726	1,908
Net earnings	112	115
Acquisitions	321	90
Redemptions	0	(618)
Distributions	(149)	(69)
Fair value and other adjustments	201	300
Redeemable Noncontrolling Interest, end of period	$ 2,211	$ 1,726	$ 1,908

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Change in noncontrolling interest during the period as a result of a change in the redemption value of redeemable noncontrolling interest.

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

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