General - Statement of Financial Position (Details) - USD ($)	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	$ 997,000,000	$ 425,000,000
Other liabilities and accrued expenses	9,142,000,000	7,737,000,000
Liabilities	93,898,000,000	90,937,000,000
Retained income	45,803,000,000	44,033,000,000
Unrealized foreign currency translation adjustments	(40,000,000)	(49,000,000)
Unamortized pension and other postretirement prior service cost	146,000,000	169,000,000
Total accumulated other comprehensive income (“AOCI”)	1,760,000,000	118,000,000
Stockholders' equity	24,476,000,000	21,312,000,000	$ 23,122,000,000
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	1,057,000,000
Other liabilities and accrued expenses	8,855,000,000
Liabilities	93,671,000,000
Retained income	47,542,000,000	45,708,000,000
Unrealized foreign currency translation adjustments	(50,000,000)	(64,000,000)
Unamortized pension and other postretirement prior service cost	(1,356,000,000)	(1,491,000,000)
Total accumulated other comprehensive income (“AOCI”)	248,000,000	(1,557,000,000)
Stockholders' equity	24,703,000,000		23,122,000,000
Impact of change | Impact of change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	(60,000,000)
Other liabilities and accrued expenses	287,000,000
Liabilities	227,000,000
Retained income	(1,739,000,000)	(1,675,000,000)
Unrealized foreign currency translation adjustments	10,000,000	15,000,000
Unamortized pension and other postretirement prior service cost	1,502,000,000	1,660,000,000
Total accumulated other comprehensive income (“AOCI”)	1,512,000,000	$ 1,675,000,000
Stockholders' equity	$ (227,000,000)		$ 0	$ 0