General - Statement of Financial Position (Details) - USD ($)	Sep. 30, 2019	Jul. 01, 2019	Jan. 01, 2019	Dec. 31, 2018	Sep. 30, 2018	Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	$ 1,079,000,000			$ 425,000,000
Other liabilities and accrued expenses	9,729,000,000			7,737,000,000
Total liabilities	94,933,000,000			90,937,000,000
Retained income	46,527,000,000			44,033,000,000
Unrealized foreign currency translation adjustments	(50,000,000)			(49,000,000)
Unrecognized pension and other postretirement benefit cost	134,000,000			169,000,000
Total AOCI	2,107,000,000			118,000,000
Total shareholders’ equity	26,140,000,000			21,312,000,000	$ 23,659,000,000
Previously reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	1,185,000,000
Other liabilities and accrued expenses	9,226,000,000
Total liabilities	94,536,000,000
Retained income	48,406,000,000			45,708,000,000
Unrealized foreign currency translation adjustments	(62,000,000)			(64,000,000)
Unrecognized pension and other postretirement benefit cost	(1,336,000,000)			(1,491,000,000)
Total AOCI	625,000,000			(1,557,000,000)
Total shareholders’ equity	26,537,000,000				23,633,000,000
Impact of change | Impact of change
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred income taxes	(106,000,000)
Other liabilities and accrued expenses	503,000,000
Total liabilities	397,000,000
Retained income	(1,879,000,000)			(1,675,000,000)
Unrealized foreign currency translation adjustments	12,000,000			15,000,000
Unrecognized pension and other postretirement benefit cost	1,470,000,000			1,660,000,000
Total AOCI	1,482,000,000			$ 1,675,000,000
Total shareholders’ equity	$ (397,000,000)	$ (12,000,000)	$ (18,000,000)		$ 26,000,000	$ 0