Retirement Benefits (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in plan assets:
Fair value of plan assets at beginning of period	$ 1,572
Fair value of plan assets at end of period	1,787	$ 1,572
United States
Change in projected benefit obligations:
Projected benefit obligations at beginning of period	71	77
Acquisitions	0	0
Service cost	0	0	$ 0
Interest cost	3	2	3
Foreign currency exchange rate changes	0	0
Actuarial (gain) loss	7	(4)
Other	0	0
Plan amendments	0	0
Benefits paid	(5)	(4)
Projected benefit obligations at end of period	76	71	77
Change in plan assets:
Fair value of plan assets at beginning of period	54	59
Acquisitions	0	0
Actual return on plan assets	10	(3)
Employer contributions	2	2
Foreign currency exchange rate changes	0	0
Benefits paid	(5)	(4)
Other	(1)	0
Fair value of plan assets at end of period	60	54	59
Funded status	(16)	(17)
Int’l
Change in projected benefit obligations:
Projected benefit obligations at beginning of period	1,751	2,046
Acquisitions	0	24
Service cost	2	2	1
Interest cost	50	50	53
Foreign currency exchange rate changes	46	(114)
Actuarial (gain) loss	214	(184)
Other	(1)	0
Plan amendments	0	20
Benefits paid	(74)	(93)
Projected benefit obligations at end of period	1,988	1,751	2,046
Change in plan assets:
Fair value of plan assets at beginning of period	1,518	1,673
Acquisitions	0	24
Actual return on plan assets	200	(28)
Employer contributions	43	39
Foreign currency exchange rate changes	41	(96)
Benefits paid	(74)	(93)
Other	(1)	(1)
Fair value of plan assets at end of period	1,727	1,518	$ 1,673
Funded status	$ (261)	$ (233)