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]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 40,610
Stockholders' Equity Attributable to Parent		$ 22,514	$ (32,482)	$ 57,823	$ (76)	$ (9,333)
Stockholders' Equity Attributable to Noncontrolling Interest							$ 2,164
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		57	3		1
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		0
Treasury Stock, Value, Acquired, Cost Method			32
Net income attributable to common shareowners	1,346			1,346
Dividends, Common Stock				609
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				18
Noncontrolling Interest, Change in Redemption Value		(7)		4
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				745
Stockholders' Equity, Other				(12)			3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						559
ASU 2018-02 adoption impact	$ (745)					(745)
Net Income (Loss) Attributable to Noncontrolling Interest							79
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							3
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							3
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							44
Noncontrolling Interest, Increase from Capital Contributions							0
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	1,028
Stock Repurchased During Period, Shares	256
Common Stock, Dividends, Per Share, Declared	$ 0.735
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
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	44,231
Stockholders' Equity Attributable to Parent	41,774	23,019	(32,626)	61,594	(64)	(10,149)
Stockholders' Equity Attributable to Noncontrolling Interest	2,457						2,457
Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture		81	4		3
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests		1
Treasury Stock, Value, Acquired, Cost Method			43
Net income attributable to common shareowners	$ (83)			(83)
Dividends, Common Stock				614
Employee Stock Ownership Plan (ESOP), Dividends Paid to ESOP				17
Noncontrolling Interest, Change in Redemption Value		0		1
Reclassification to Retained Earnings, current period, ASU 2018-02 adoption impact				0
Stockholders' Equity, Other				(55)			0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent						(1,639)
ASU 2018-02 adoption impact						0
Net Income (Loss) Attributable to Noncontrolling Interest							97
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest							0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest							(6)
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders							58
Noncontrolling Interest, Increase from Capital Contributions							34
Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture	2,050
Stock Repurchased During Period, Shares	330
Common Stock, Dividends, Per Share, Declared	$ 0.735
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 41,935
Stockholders' Equity Attributable to Parent	39,411	$ 23,099	$ (32,665)	$ 60,826	$ (61)	$ (11,788)
Stockholders' Equity Attributable to Noncontrolling Interest	$ 2,524						$ 2,524