Reclassifications out of Accumulated Other Comprehensive Loss - Changes in AOCL (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 3,920
Balance at end of period	4,507	$ 3,920
Foreign Currency Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(946)	(894)	$ (690)
Other comprehensive income (loss) before reclassifications	(209)	(251)	(206)
Amounts reclassified from accumulated other comprehensive loss	0	16	3
Purchase of subsidiary shares from minority interest		(3)	(1)
Deconsolidation of Venezuelan subsidiary		186
Balance at end of period	(1,155)	(946)	(894)
Unrecognized Net Actuarial Losses and Prior Service Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(3,071)	(3,285)	(3,278)
Other comprehensive income (loss) before reclassifications	(62)	(68)	(112)
Amounts reclassified from accumulated other comprehensive loss	80	325	105
Purchase of subsidiary shares from minority interest		(105)	0
Deconsolidation of Venezuelan subsidiary		62
Balance at end of period	(3,053)	(3,071)	(3,285)
Deferred Derivative Gains (Losses)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	7	12	(1)
Other comprehensive income (loss) before reclassifications	8	15	13
Amounts reclassified from accumulated other comprehensive loss	(5)	(21)	0
Purchase of subsidiary shares from minority interest		1	0
Deconsolidation of Venezuelan subsidiary		0
Balance at end of period	10	7	12
Unrealized Investment Gains
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	0	36	34
Other comprehensive income (loss) before reclassifications	0	(4)	2
Amounts reclassified from accumulated other comprehensive loss	0	(32)	0
Purchase of subsidiary shares from minority interest		0	0
Deconsolidation of Venezuelan subsidiary		0
Balance at end of period	0	0	36
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(4,010)	(4,131)	(3,935)
Other comprehensive income (loss) before reclassifications	(263)	(308)	(303)
Amounts reclassified from accumulated other comprehensive loss	75	288	108
Purchase of subsidiary shares from minority interest		(107)	(1)
Deconsolidation of Venezuelan subsidiary		248
Balance at end of period	$ (4,198)	$ (4,010)	$ (4,131)