Condensed Consolidated Statement of Changes in Equity Statement - USD ($) shares in Thousands, $ in Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Deferred Compensation, Share-based Payments [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	ASU 2014-09 [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 31,421
Stockholders' Equity Attributable to Parent		$ 17,574	$ (35,596)	$ 55,242	$ (85)	$ (7,525)
Stockholders' Equity Attributable to Noncontrolling Interest							$ 1,811
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		296	4		6
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1					1
Treasury Stock, Value, Acquired, Cost Method			75
Net income attributable to common shareowners	$ 4,583			4,583
Dividends, Common Stock				1,606
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				53
Noncontrolling Interest, Change in Redemption Value		0		(8)
Stockholders' Equity, Other				28			10	$ (480)
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(198)
Net Income (Loss) Attributable to Noncontrolling Interest							273
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							(5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(24)
Reclassification from OCI, current period, ASU 2018-02 adoption impact						0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							212
Non-controlling interest, decrease from disposition of non-controlling interest							8
Noncontrolling Interest, Increase from Capital Contributions							300
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	2,361,000
Stock Repurchased During Period, Shares	574
Common Stock, Dividends, Per Share, Declared	$ 2.10
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 33,346
Stockholders' Equity Attributable to Parent		17,747	(35,645)	57,027	(81)	(7,684)
Stockholders' Equity Attributable to Noncontrolling Interest							1,982
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		122	1		2
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		0					0
Treasury Stock, Value, Acquired, Cost Method			23
Net income attributable to common shareowners	$ 1,238			1,238
Dividends, Common Stock				536
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				18
Noncontrolling Interest, Change in Redemption Value		0		(6)
Stockholders' Equity, Other				1			5	0
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(39)
Net Income (Loss) Attributable to Noncontrolling Interest							111
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(19)
Reclassification from OCI, current period, ASU 2018-02 adoption impact						0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							73
Non-controlling interest, decrease from disposition of non-controlling interest							0
Noncontrolling Interest, Increase from Capital Contributions							138
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	1,051
Stock Repurchased During Period, Shares	172
Common Stock, Dividends, Per Share, Declared	$ 0.70
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 34,250
Stockholders' Equity Attributable to Parent		17,869	(35,667)	57,706	(79)	(7,723)
Stockholders' Equity Attributable to Noncontrolling Interest							2,144
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	40,610
Stockholders' Equity Attributable to Parent	38,446	22,514	(32,482)	57,823	(76)	(9,333)
Stockholders' Equity Attributable to Noncontrolling Interest	2,164						2,164
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		372	5		9
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1					3
Treasury Stock, Value, Acquired, Cost Method			111
Net income attributable to common shareowners	4,394			4,394
Dividends, Common Stock				1,830
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				53
Noncontrolling Interest, Change in Redemption Value		(12)		7
Stockholders' Equity, Other				(17)			0	0
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				745
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(741)
Net Income (Loss) Attributable to Noncontrolling Interest							287
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							7
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(14)
Reclassification from OCI, current period, ASU 2018-02 adoption impact	$ (745)					(745)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							184
Non-controlling interest, decrease from disposition of non-controlling interest							(3)
Noncontrolling Interest, Increase from Capital Contributions							91
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	2,554
Stock Repurchased During Period, Shares	857
Common Stock, Dividends, Per Share, Declared	$ 2.21
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 42,977
Stockholders' Equity Attributable to Parent		22,718	(32,549)	60,548	(71)	(9,892)
Stockholders' Equity Attributable to Noncontrolling Interest							2,223
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		161	1		4
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1					(2)
Treasury Stock, Value, Acquired, Cost Method			40
Net income attributable to common shareowners	$ 1,148			1,148
Dividends, Common Stock				611
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				17
Noncontrolling Interest, Change in Redemption Value		(5)		14
Stockholders' Equity, Other				(13)			0	$ 0
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(927)
Net Income (Loss) Attributable to Noncontrolling Interest							109
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							2
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(18)
Reclassification from OCI, current period, ASU 2018-02 adoption impact						0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							39
Non-controlling interest, decrease from disposition of non-controlling interest							3
Noncontrolling Interest, Increase from Capital Contributions							73
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	727
Stock Repurchased During Period, Shares	304
Common Stock, Dividends, Per Share, Declared	$ 0.74
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 42,819
Stockholders' Equity Attributable to Parent	40,468	$ 22,873	$ (32,588)	$ 61,069	$ (67)	$ (10,819)
Stockholders' Equity Attributable to Noncontrolling Interest	$ 2,351						$ 2,351