General - Statement of Financial Position (Details) - USD ($)	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	$ 817,000,000		$ 425,000,000
Other liabilities and accrued expenses	8,977,000,000		7,737,000,000
Liabilities	92,416,000,000		90,937,000,000
Retained income	45,148,000,000		44,033,000,000
Unrealized foreign currency translation adjustments	(44,000,000)		(49,000,000)
Unamortized pension and other postretirement prior service cost	157,000,000		169,000,000
Total accumulated other comprehensive income (“AOCI”)	1,085,000,000		118,000,000
Stockholders' Equity Attributable to Parent	23,418,000,000		21,312,000,000	$ 23,273,000,000
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	822,000,000
Other liabilities and accrued expenses	8,953,000,000
Liabilities	92,397,000,000
Retained income	46,818,000,000		45,708,000,000
Unrealized foreign currency translation adjustments	(57,000,000)		(64,000,000)
Unamortized pension and other postretirement prior service cost	(1,481,000,000)		(1,491,000,000)
Total accumulated other comprehensive income (“AOCI”)	(566,000,000)		(1,557,000,000)
Stockholders' Equity Attributable to Parent	23,437,000,000			23,277,000,000
Impact of change | Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	(5,000,000)
Other liabilities and accrued expenses	24,000,000
Liabilities	19,000,000
Retained income	(1,670,000,000)		(1,675,000,000)
Unrealized foreign currency translation adjustments	13,000,000		15,000,000
Unamortized pension and other postretirement prior service cost	(1,638,000,000)		1,660,000,000
Total accumulated other comprehensive income (“AOCI”)	1,651,000,000		$ 1,675,000,000
Stockholders' Equity Attributable to Parent	$ (19,000,000)	$ 0		$ (4,000,000)