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		174	3		4
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1					1
Treasury Stock, Value, Acquired, Cost Method			52
Net income attributable to common shareowners	$ 3,345			3,345
Dividends, Common Stock				1,070
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				35
Noncontrolling Interest, Change in Redemption Value		0		(2)
Stockholders' Equity, Other				27			5	$ (480)
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(159)
Net Income (Loss) Attributable to Noncontrolling Interest							162
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							(5)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(5)
Reclassification from OCI, current period, ASU 2018-02 adoption impact						0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							139
Non-controlling interest, decrease from disposition of non-controlling interest							8
Noncontrolling Interest, Increase from Capital Contributions							162
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	1,310,000
Stock Repurchased During Period, Shares	402
Common Stock, Dividends, Per Share, Declared	$ 1.400
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 32,492
Stockholders' Equity Attributable to Parent		17,641	(35,619)	55,533	(84)	(6,937)
Stockholders' Equity Attributable to Noncontrolling Interest							1,958
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		106	1		3
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		0					0
Treasury Stock, Value, Acquired, Cost Method			27
Net income attributable to common shareowners	$ 2,048			2,048
Dividends, Common Stock				535
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				17
Noncontrolling Interest, Change in Redemption Value		0		0
Stockholders' Equity, Other				(2)			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						(747)
Net Income (Loss) Attributable to Noncontrolling Interest							91
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							(3)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(38)
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							42
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	235
Stock Repurchased During Period, Shares	214
Common Stock, Dividends, Per Share, Declared	$ 0.700
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
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		211	4		5
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		0					1
Treasury Stock, Value, Acquired, Cost Method			71
Net income attributable to common shareowners	3,246			3,246
Dividends, Common Stock				1,219
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				36
Noncontrolling Interest, Change in Redemption Value		(7)		(7)
Stockholders' Equity, Other				(4)			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						186
Net Income (Loss) Attributable to Noncontrolling Interest							178
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							5
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							4
Reclassification from OCI, current period, ASU 2018-02 adoption impact	$ (745)					(745)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							145
Non-controlling interest, decrease from disposition of non-controlling interest							0
Noncontrolling Interest, Increase from Capital Contributions							18
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	1,827
Stock Repurchased During Period, Shares	553
Common Stock, Dividends, Per Share, Declared	$ 1.470
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 41,946
Stockholders' Equity Attributable to Parent		22,564	(32,511)	59,279	(75)	(9,519)
Stockholders' Equity Attributable to Noncontrolling Interest							2,208
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		154	1		4
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		0					(1)
Treasury Stock, Value, Acquired, Cost Method			39
Net income attributable to common shareowners	$ 1,900			1,900
Dividends, Common Stock				610
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				18
Noncontrolling Interest, Change in Redemption Value		0		(11)
Stockholders' Equity, Other				8			(3)	$ 0
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(373)
Net Income (Loss) Attributable to Noncontrolling Interest							99
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							2
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							1
Reclassification from OCI, current period, ASU 2018-02 adoption impact						0
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							101
Non-controlling interest, decrease from disposition of non-controlling interest							0
Noncontrolling Interest, Increase from Capital Contributions							18
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	799
Stock Repurchased During Period, Shares	297
Common Stock, Dividends, Per Share, Declared	$ 0.740
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 42,977
Stockholders' Equity Attributable to Parent	40,754	$ 22,718	$ (32,549)	$ 60,548	$ (71)	$ (9,892)
Stockholders' Equity Attributable to Noncontrolling Interest	$ 2,223						$ 2,223